Plasma somatotropin and prolactin concentrations in young dairy sires before and after a 24-hour fast
To examine the efficacy of plasma concentrations of bST or prolactin as predictors of expected daughter performance, blood samples were collected from young Holstein sires. Blood samples were collected at 15-min intervals via jugular cannulas from 1000 until 1600 h (d 1), beginning 4 h after morning...
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| Veröffentlicht in: | Journal of dairy science 1990-11, Vol.73 (11), p.3112-3117 |
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| creator | Kazmer, G.W. (University of Connecticut, Storrs) Canfield, R.W Bean, B |
| description | To examine the efficacy of plasma concentrations of bST or prolactin as predictors of expected daughter performance, blood samples were collected from young Holstein sires. Blood samples were collected at 15-min intervals via jugular cannulas from 1000 until 1600 h (d 1), beginning 4 h after morning hay feeding. Bulls were not fed again until after collection of blood samples on d 2. Samples were collected at 15-min intervals from 1000 until 1300 h on d 2. Peak values and frequency of hormonal secretory patterns of each bull were characterized by an iterative process in which values greater than 2 SD from the mean were flagged as peaks and excluded from the subsequent calculation of SD and mean. The process continued until an iteration in which no new peaks were flagged. Imposition of a 24-h fast did not alter mean basal bST or prolactin concentrations, but reduced mean peak and overall concentrations of both hormones. The number of bST peaks on d 1 was inversely related to both USDA and Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and both USDA and Northeast Artificial Insemination Sire Comparison sire PD for milk yield, but was positively correlated on d 2 with USDA Pedigree Index for milk yield. Mean peak bST on d 2 was correlated with Northeast Artificial Insemination Sire Comparison Estimated Breeding Value for fat yield and sire USDA PD for fat yield. Prolactin peak frequency on d 1 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and sire PD for fat yield. Difference between mean prolactin on d 1 and 2 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and Estimated Breeding Value for fat yield. Endocrine parameters in young sires may be related to genetic merit for production parameters. |
| doi_str_mv | 10.3168/jds.S0022-0302(90)78999-0 |
| format | Article |
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(University of Connecticut, Storrs) ; Canfield, R.W ; Bean, B</creator><creatorcontrib>Kazmer, G.W. (University of Connecticut, Storrs) ; Canfield, R.W ; Bean, B</creatorcontrib><description>To examine the efficacy of plasma concentrations of bST or prolactin as predictors of expected daughter performance, blood samples were collected from young Holstein sires. Blood samples were collected at 15-min intervals via jugular cannulas from 1000 until 1600 h (d 1), beginning 4 h after morning hay feeding. Bulls were not fed again until after collection of blood samples on d 2. Samples were collected at 15-min intervals from 1000 until 1300 h on d 2. Peak values and frequency of hormonal secretory patterns of each bull were characterized by an iterative process in which values greater than 2 SD from the mean were flagged as peaks and excluded from the subsequent calculation of SD and mean. The process continued until an iteration in which no new peaks were flagged. Imposition of a 24-h fast did not alter mean basal bST or prolactin concentrations, but reduced mean peak and overall concentrations of both hormones. The number of bST peaks on d 1 was inversely related to both USDA and Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and both USDA and Northeast Artificial Insemination Sire Comparison sire PD for milk yield, but was positively correlated on d 2 with USDA Pedigree Index for milk yield. Mean peak bST on d 2 was correlated with Northeast Artificial Insemination Sire Comparison Estimated Breeding Value for fat yield and sire USDA PD for fat yield. Prolactin peak frequency on d 1 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and sire PD for fat yield. Difference between mean prolactin on d 1 and 2 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and Estimated Breeding Value for fat yield. Endocrine parameters in young sires may be related to genetic merit for production parameters.</description><identifier>ISSN: 0022-0302</identifier><identifier>EISSN: 1525-3198</identifier><identifier>DOI: 10.3168/jds.S0022-0302(90)78999-0</identifier><identifier>PMID: 2273140</identifier><language>eng</language><publisher>United States: Am Dairy Sci Assoc</publisher><subject>Animals ; BLOOD PLASMA ; BOVIN LAITIER ; Breeding ; BREEDING VALUE ; BULLS ; CALVES ; Cattle - blood ; COW INDEXES ; COWS ; DAIRY CATTLE ; DESEMPENO ; ESTIMATED BREEDING VALUE ; EVALUACION DE SEMENTALES ; EVALUATION GENETIQUE DES PERES ; fasting ; Fasting - blood ; GANADO DE LECHE ; GENETIC MERIT ; GRASA DE LA LECHE ; Growth Hormone - blood ; HORMONAS ; HORMONAS PITUITARIAS ; HORMONE ; HORMONE HYPOPHYSAIRE ; HORMONES ; INANICION ; INANITION ; Male ; MATIERE GRASSE DU LAIT ; MILK FAT ; MILK FAT YIELD ; MILK YIELD ; Pedigree ; PEDIGREE INDEX ; PERFORMANCE INDEXES ; PITUITARY HORMONES ; PLASMA SANGUIN ; PLASMA SANGUINEO ; PREDICTED DIFFERENCE ; PROLACTIN ; Prolactin - blood ; PROLACTINA ; PROLACTINE ; Regression Analysis ; RENDEMENT ; RENDEMENT LAITIER ; RENDIMIENTO ; RENDIMIENTO LECHERO ; SECRECION ; SECRETION ; SIRE EVALUATION ; STARVATION ; TAUREAU ; TERNERO ; TORO ; VACA ; VACHE ; VALEUR GENETIQUE ; VALOR GENETICO ; VEAU ; YIELDS</subject><ispartof>Journal of dairy science, 1990-11, Vol.73 (11), p.3112-3117</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c473t-551e44874b5c644ac3e45656cf0d2d60d28e391d6a02f96c999016115ff9edfa3</citedby><cites>FETCH-LOGICAL-c473t-551e44874b5c644ac3e45656cf0d2d60d28e391d6a02f96c999016115ff9edfa3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27846,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/2273140$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kazmer, G.W. (University of Connecticut, Storrs)</creatorcontrib><creatorcontrib>Canfield, R.W</creatorcontrib><creatorcontrib>Bean, B</creatorcontrib><title>Plasma somatotropin and prolactin concentrations in young dairy sires before and after a 24-hour fast</title><title>Journal of dairy science</title><addtitle>J Dairy Sci</addtitle><description>To examine the efficacy of plasma concentrations of bST or prolactin as predictors of expected daughter performance, blood samples were collected from young Holstein sires. Blood samples were collected at 15-min intervals via jugular cannulas from 1000 until 1600 h (d 1), beginning 4 h after morning hay feeding. Bulls were not fed again until after collection of blood samples on d 2. Samples were collected at 15-min intervals from 1000 until 1300 h on d 2. Peak values and frequency of hormonal secretory patterns of each bull were characterized by an iterative process in which values greater than 2 SD from the mean were flagged as peaks and excluded from the subsequent calculation of SD and mean. The process continued until an iteration in which no new peaks were flagged. Imposition of a 24-h fast did not alter mean basal bST or prolactin concentrations, but reduced mean peak and overall concentrations of both hormones. The number of bST peaks on d 1 was inversely related to both USDA and Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and both USDA and Northeast Artificial Insemination Sire Comparison sire PD for milk yield, but was positively correlated on d 2 with USDA Pedigree Index for milk yield. Mean peak bST on d 2 was correlated with Northeast Artificial Insemination Sire Comparison Estimated Breeding Value for fat yield and sire USDA PD for fat yield. Prolactin peak frequency on d 1 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and sire PD for fat yield. Difference between mean prolactin on d 1 and 2 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and Estimated Breeding Value for fat yield. Endocrine parameters in young sires may be related to genetic merit for production parameters.</description><subject>Animals</subject><subject>BLOOD PLASMA</subject><subject>BOVIN LAITIER</subject><subject>Breeding</subject><subject>BREEDING VALUE</subject><subject>BULLS</subject><subject>CALVES</subject><subject>Cattle - blood</subject><subject>COW INDEXES</subject><subject>COWS</subject><subject>DAIRY CATTLE</subject><subject>DESEMPENO</subject><subject>ESTIMATED BREEDING VALUE</subject><subject>EVALUACION DE SEMENTALES</subject><subject>EVALUATION GENETIQUE DES PERES</subject><subject>fasting</subject><subject>Fasting - blood</subject><subject>GANADO DE LECHE</subject><subject>GENETIC MERIT</subject><subject>GRASA DE LA LECHE</subject><subject>Growth Hormone - blood</subject><subject>HORMONAS</subject><subject>HORMONAS PITUITARIAS</subject><subject>HORMONE</subject><subject>HORMONE HYPOPHYSAIRE</subject><subject>HORMONES</subject><subject>INANICION</subject><subject>INANITION</subject><subject>Male</subject><subject>MATIERE GRASSE DU LAIT</subject><subject>MILK FAT</subject><subject>MILK FAT YIELD</subject><subject>MILK YIELD</subject><subject>Pedigree</subject><subject>PEDIGREE INDEX</subject><subject>PERFORMANCE INDEXES</subject><subject>PITUITARY HORMONES</subject><subject>PLASMA SANGUIN</subject><subject>PLASMA SANGUINEO</subject><subject>PREDICTED DIFFERENCE</subject><subject>PROLACTIN</subject><subject>Prolactin - blood</subject><subject>PROLACTINA</subject><subject>PROLACTINE</subject><subject>Regression Analysis</subject><subject>RENDEMENT</subject><subject>RENDEMENT LAITIER</subject><subject>RENDIMIENTO</subject><subject>RENDIMIENTO LECHERO</subject><subject>SECRECION</subject><subject>SECRETION</subject><subject>SIRE EVALUATION</subject><subject>STARVATION</subject><subject>TAUREAU</subject><subject>TERNERO</subject><subject>TORO</subject><subject>VACA</subject><subject>VACHE</subject><subject>VALEUR GENETIQUE</subject><subject>VALOR GENETICO</subject><subject>VEAU</subject><subject>YIELDS</subject><issn>0022-0302</issn><issn>1525-3198</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>K30</sourceid><recordid>eNqFkUuLFDEQx4Mo6zj6BQQhIvg49JrKq5OjLL5gQWHdc8ikk5keejpj0o3Mt7fmwR68eEmo1K_qn6o_Ia-BXQvQ5uO2q9d3jHHeMMH4e8s-tMZa27BHZAGKq0aANY_J4gF5Sp7VusUQOFNX5IrzVoBkCxJ_Dr7uPK1556c8lbzvR-rHju5LHnyYMAp5DHGcip_6PFaKL4c8j2va-b4caO1LrHQVUy7xVOjTFAv1lMtmk-dCk6_Tc_Ik-aHGF5d7Se6_fP518625_fH1-82n2ybIVkyNUhClNK1cqaCl9EFEqbTSIbGOdxoPE4WFTnvGk9UBR2agAVRKNnbJiyV5e-6Lv_89xzq5XV9DHAY_xjxXZ3ABSqPW_0BQRirDj-Cbf8AtDjXiEA5M2zJtcdNI2TMVSq61xOT2pd_5cnDA3NExh465k2PuaIezzJ0cw2hJXl0U5tUudg-VF4sw_-6c3_TrzR_ctkO_hgFpOHZthQNADeBIvjyTyWfn16Wv7v7OAjBhjPgLDgGnnQ</recordid><startdate>19901101</startdate><enddate>19901101</enddate><creator>Kazmer, G.W. (University of Connecticut, Storrs)</creator><creator>Canfield, R.W</creator><creator>Bean, B</creator><general>Am Dairy Sci Assoc</general><general>American Dairy Science Association</general><scope>FBQ</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7WH</scope><scope>K30</scope><scope>PAAUG</scope><scope>PAWHS</scope><scope>PAWZZ</scope><scope>PAXOH</scope><scope>PBHAV</scope><scope>PBQSW</scope><scope>PBYQZ</scope><scope>PCIWU</scope><scope>PCMID</scope><scope>PCZJX</scope><scope>PDGRG</scope><scope>PDWWI</scope><scope>PETMR</scope><scope>PFVGT</scope><scope>PGXDX</scope><scope>PIHIL</scope><scope>PISVA</scope><scope>PJCTQ</scope><scope>PJTMS</scope><scope>PLCHJ</scope><scope>PMHAD</scope><scope>PNQDJ</scope><scope>POUND</scope><scope>PPLAD</scope><scope>PQAPC</scope><scope>PQCAN</scope><scope>PQCMW</scope><scope>PQEME</scope><scope>PQHKH</scope><scope>PQMID</scope><scope>PQNCT</scope><scope>PQNET</scope><scope>PQSCT</scope><scope>PQSET</scope><scope>PSVJG</scope><scope>PVMQY</scope><scope>PZGFC</scope><scope>7QL</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>M81</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>19901101</creationdate><title>Plasma somatotropin and prolactin concentrations in young dairy sires before and after a 24-hour fast</title><author>Kazmer, G.W. (University of Connecticut, Storrs) ; Canfield, R.W ; Bean, B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c473t-551e44874b5c644ac3e45656cf0d2d60d28e391d6a02f96c999016115ff9edfa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1990</creationdate><topic>Animals</topic><topic>BLOOD PLASMA</topic><topic>BOVIN LAITIER</topic><topic>Breeding</topic><topic>BREEDING VALUE</topic><topic>BULLS</topic><topic>CALVES</topic><topic>Cattle - blood</topic><topic>COW INDEXES</topic><topic>COWS</topic><topic>DAIRY CATTLE</topic><topic>DESEMPENO</topic><topic>ESTIMATED BREEDING VALUE</topic><topic>EVALUACION DE SEMENTALES</topic><topic>EVALUATION GENETIQUE DES PERES</topic><topic>fasting</topic><topic>Fasting - blood</topic><topic>GANADO DE LECHE</topic><topic>GENETIC MERIT</topic><topic>GRASA DE LA LECHE</topic><topic>Growth Hormone - blood</topic><topic>HORMONAS</topic><topic>HORMONAS PITUITARIAS</topic><topic>HORMONE</topic><topic>HORMONE HYPOPHYSAIRE</topic><topic>HORMONES</topic><topic>INANICION</topic><topic>INANITION</topic><topic>Male</topic><topic>MATIERE GRASSE DU LAIT</topic><topic>MILK FAT</topic><topic>MILK FAT YIELD</topic><topic>MILK YIELD</topic><topic>Pedigree</topic><topic>PEDIGREE INDEX</topic><topic>PERFORMANCE INDEXES</topic><topic>PITUITARY HORMONES</topic><topic>PLASMA SANGUIN</topic><topic>PLASMA SANGUINEO</topic><topic>PREDICTED DIFFERENCE</topic><topic>PROLACTIN</topic><topic>Prolactin - blood</topic><topic>PROLACTINA</topic><topic>PROLACTINE</topic><topic>Regression Analysis</topic><topic>RENDEMENT</topic><topic>RENDEMENT LAITIER</topic><topic>RENDIMIENTO</topic><topic>RENDIMIENTO LECHERO</topic><topic>SECRECION</topic><topic>SECRETION</topic><topic>SIRE EVALUATION</topic><topic>STARVATION</topic><topic>TAUREAU</topic><topic>TERNERO</topic><topic>TORO</topic><topic>VACA</topic><topic>VACHE</topic><topic>VALEUR GENETIQUE</topic><topic>VALOR GENETICO</topic><topic>VEAU</topic><topic>YIELDS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kazmer, G.W. (University of Connecticut, Storrs)</creatorcontrib><creatorcontrib>Canfield, R.W</creatorcontrib><creatorcontrib>Bean, B</creatorcontrib><collection>AGRIS</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Periodicals Index Online Segment 50</collection><collection>Periodicals Index Online</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - West</collection><collection>Primary Sources Access (Plan D) - International</collection><collection>Primary Sources Access & Build (Plan A) - MEA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Midwest</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Northeast</collection><collection>Primary Sources Access (Plan D) - Southeast</collection><collection>Primary Sources Access (Plan D) - North Central</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Southeast</collection><collection>Primary Sources Access (Plan D) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - UK / I</collection><collection>Primary Sources Access (Plan D) - Canada</collection><collection>Primary Sources Access (Plan D) - EMEALA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - North Central</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - International</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - International</collection><collection>Primary Sources Access (Plan D) - West</collection><collection>Periodicals Index Online Segments 1-50</collection><collection>Primary Sources Access (Plan D) - APAC</collection><collection>Primary Sources Access (Plan D) - Midwest</collection><collection>Primary Sources Access (Plan D) - MEA</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - Canada</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - UK / I</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - EMEALA</collection><collection>Primary Sources Access & Build (Plan A) - APAC</collection><collection>Primary Sources Access & Build (Plan A) - Canada</collection><collection>Primary Sources Access & Build (Plan A) - West</collection><collection>Primary Sources Access & Build (Plan A) - EMEALA</collection><collection>Primary Sources Access (Plan D) - Northeast</collection><collection>Primary Sources Access & Build (Plan A) - Midwest</collection><collection>Primary Sources Access & Build (Plan A) - North Central</collection><collection>Primary Sources Access & Build (Plan A) - Northeast</collection><collection>Primary Sources Access & Build (Plan A) - South Central</collection><collection>Primary Sources Access & Build (Plan A) - Southeast</collection><collection>Primary Sources Access (Plan D) - UK / I</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - APAC</collection><collection>Primary Sources Access—Foundation Edition (Plan E) - MEA</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biochemistry Abstracts 3</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of dairy science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kazmer, G.W. (University of Connecticut, Storrs)</au><au>Canfield, R.W</au><au>Bean, B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Plasma somatotropin and prolactin concentrations in young dairy sires before and after a 24-hour fast</atitle><jtitle>Journal of dairy science</jtitle><addtitle>J Dairy Sci</addtitle><date>1990-11-01</date><risdate>1990</risdate><volume>73</volume><issue>11</issue><spage>3112</spage><epage>3117</epage><pages>3112-3117</pages><issn>0022-0302</issn><eissn>1525-3198</eissn><abstract>To examine the efficacy of plasma concentrations of bST or prolactin as predictors of expected daughter performance, blood samples were collected from young Holstein sires. Blood samples were collected at 15-min intervals via jugular cannulas from 1000 until 1600 h (d 1), beginning 4 h after morning hay feeding. Bulls were not fed again until after collection of blood samples on d 2. Samples were collected at 15-min intervals from 1000 until 1300 h on d 2. Peak values and frequency of hormonal secretory patterns of each bull were characterized by an iterative process in which values greater than 2 SD from the mean were flagged as peaks and excluded from the subsequent calculation of SD and mean. The process continued until an iteration in which no new peaks were flagged. Imposition of a 24-h fast did not alter mean basal bST or prolactin concentrations, but reduced mean peak and overall concentrations of both hormones. The number of bST peaks on d 1 was inversely related to both USDA and Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and both USDA and Northeast Artificial Insemination Sire Comparison sire PD for milk yield, but was positively correlated on d 2 with USDA Pedigree Index for milk yield. Mean peak bST on d 2 was correlated with Northeast Artificial Insemination Sire Comparison Estimated Breeding Value for fat yield and sire USDA PD for fat yield. Prolactin peak frequency on d 1 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and sire PD for fat yield. Difference between mean prolactin on d 1 and 2 was negatively related to Northeast Artificial Insemination Sire Comparison Pedigree Index for milk yield and Estimated Breeding Value for fat yield. Endocrine parameters in young sires may be related to genetic merit for production parameters.</abstract><cop>United States</cop><pub>Am Dairy Sci Assoc</pub><pmid>2273140</pmid><doi>10.3168/jds.S0022-0302(90)78999-0</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of dairy science, 1990-11, Vol.73 (11), p.3112-3117 |
| issn | 0022-0302 1525-3198 |
| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Periodicals Index Online |
| subjects | Animals BLOOD PLASMA BOVIN LAITIER Breeding BREEDING VALUE BULLS CALVES Cattle - blood COW INDEXES COWS DAIRY CATTLE DESEMPENO ESTIMATED BREEDING VALUE EVALUACION DE SEMENTALES EVALUATION GENETIQUE DES PERES fasting Fasting - blood GANADO DE LECHE GENETIC MERIT GRASA DE LA LECHE Growth Hormone - blood HORMONAS HORMONAS PITUITARIAS HORMONE HORMONE HYPOPHYSAIRE HORMONES INANICION INANITION Male MATIERE GRASSE DU LAIT MILK FAT MILK FAT YIELD MILK YIELD Pedigree PEDIGREE INDEX PERFORMANCE INDEXES PITUITARY HORMONES PLASMA SANGUIN PLASMA SANGUINEO PREDICTED DIFFERENCE PROLACTIN Prolactin - blood PROLACTINA PROLACTINE Regression Analysis RENDEMENT RENDEMENT LAITIER RENDIMIENTO RENDIMIENTO LECHERO SECRECION SECRETION SIRE EVALUATION STARVATION TAUREAU TERNERO TORO VACA VACHE VALEUR GENETIQUE VALOR GENETICO VEAU YIELDS |
| title | Plasma somatotropin and prolactin concentrations in young dairy sires before and after a 24-hour fast |
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