Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls
The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 mon...
Gespeichert in:
Veröffentlicht in: | Tropical animal health and production 2011-01, Vol.43 (1), p.159-164 |
---|---|
Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | 164 |
---|---|
container_issue | 1 |
container_start_page | 159 |
container_title | Tropical animal health and production |
container_volume | 43 |
creator | Ahmad, Ejaz Ahmad, Nasim Naseer, Zahid Aleem, Muhammad Khan, Muhammad Sarwar Ashiq, Muhammad Younis, Muhammad |
description | The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 months of age). Bulls were evaluated for SC, BW, and NP. Semen was evaluated once a week for five consecutive weeks from regularly collected donor bulls (
n
= 86) ranging in age from 25–30 to >100 months. Ejaculate volume, sperm motility, sperm concentration, sperm morphology, percent live sperms, sperm plasma membrane integrity, and normal acrosome were compared among different age groups. Mean SC and BW increased (
P
100 months of age. Mean NP of testicular ultrasonograms increased (
P
100 months of age. Body weight, SC, and NP were positively correlated with age from birth until >100 months (
r
= 0.91, 0.87, and 0.40, respectively). Ejaculate volume (5.7 ± 0.2 vs. 4.6 ± 0.09 ml) and sperm concentration (1,281.6 ± 17.7 vs. 1,115.8 ± 55.9 × 10
6
/ml) increased (
P
|
doi_str_mv | 10.1007/s11250-010-9668-1 |
format | Article |
fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_893268931</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>815961597</sourcerecordid><originalsourceid>FETCH-LOGICAL-c468t-902867a95721319e2be51c092cc4975626011d7035b58547b67cc37983e3d0663</originalsourceid><addsrcrecordid>eNqFkUuLFDEURoMoTjv6A9xIcOOmS_OqPJYy-IIBwcc6pFLp7gyppCcPxv73puhRQRAXSRb33C-5OQA8x-g1Rki8KRiTEQ0Io0FxLgf8AGzwKOggGJUPwQYhpgYmmLgAT0q5QR1Ekj8GFwRxiRijG_Djiwum-hTLwR9h2kGzd7AmOKX5BO-c3x_qFhabUzUBWp9tW3Yuu2jdFlZXqrctmAxbqNmUFNM-m6VsoYkzLG5xEd42E3w9QR_hV3Pwdz1maiGUp-DRzoTint2fl-D7-3ffrj4O158_fLp6ez1YxmUdFCKSC6NGQTDFypHJjdgiRaxlSoyccITxLBAdp1GOTExcWEuFktTRGXFOL8Grc-4xp9vWX6wXX6wLwUSXWtFSUcL7hv9P4lHxvkQnX_5F3qSWYx9jhYgiVK5x-Az1zyslu50-Zr-YfNIY6VWfPuvT3Ype9em158V9cJsWN__u-OWrA-QMlF6Ke5f_3Pzv1J-vxaQz</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>815292381</pqid></control><display><type>article</type><title>Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls</title><source>MEDLINE</source><source>Springer Nature - Complete Springer Journals</source><creator>Ahmad, Ejaz ; Ahmad, Nasim ; Naseer, Zahid ; Aleem, Muhammad ; Khan, Muhammad Sarwar ; Ashiq, Muhammad ; Younis, Muhammad</creator><creatorcontrib>Ahmad, Ejaz ; Ahmad, Nasim ; Naseer, Zahid ; Aleem, Muhammad ; Khan, Muhammad Sarwar ; Ashiq, Muhammad ; Younis, Muhammad</creatorcontrib><description>The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 months of age). Bulls were evaluated for SC, BW, and NP. Semen was evaluated once a week for five consecutive weeks from regularly collected donor bulls (
n
= 86) ranging in age from 25–30 to >100 months. Ejaculate volume, sperm motility, sperm concentration, sperm morphology, percent live sperms, sperm plasma membrane integrity, and normal acrosome were compared among different age groups. Mean SC and BW increased (
P
< 0.05) in a curvilinear manner from birth to >100 months of age. Mean NP of testicular ultrasonograms increased (
P
< 0.05) from 0 to 24 months and then plateaued until >100 months of age. Body weight, SC, and NP were positively correlated with age from birth until >100 months (
r
= 0.91, 0.87, and 0.40, respectively). Ejaculate volume (5.7 ± 0.2 vs. 4.6 ± 0.09 ml) and sperm concentration (1,281.6 ± 17.7 vs. 1,115.8 ± 55.9 × 10
6
/ml) increased (
P
< 0.05) in mature bulls compared to younger ones. However, motility (68.6 ± 0.3%), plasma membrane integrity (50.8 ± 1.0%), and normal acrosome (74.8 ± 0.5%) remained insignificant due to age. In six of eight age groups studied, morphological abnormalities were well within the range (18.1 ± 0.3%). In conclusion, the BW, SC, and NP of testicular ultrasonograms, ejaculate volume, and concentration increased with age. Moreover, semen quality is fairly independent of age except volume and concentration in Sahiwal bulls.</description><identifier>ISSN: 0049-4747</identifier><identifier>EISSN: 1573-7438</identifier><identifier>DOI: 10.1007/s11250-010-9668-1</identifier><identifier>PMID: 20680443</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Acrosomes ; Age ; Age Factors ; Animals ; Biomedical and Life Sciences ; Birth ; Body weight ; Body Weight - physiology ; Cattle - anatomy & histology ; Cattle - physiology ; Life Sciences ; Linear Models ; Male ; Motility ; Organ Size ; Original Research ; Pakistan ; Plasma membranes ; Scrotum - anatomy & histology ; Semen ; Semen Analysis ; Sperm ; Testes ; Testis - diagnostic imaging ; Ultrasonography ; Veterinary Medicine/Veterinary Science ; Zoology</subject><ispartof>Tropical animal health and production, 2011-01, Vol.43 (1), p.159-164</ispartof><rights>Springer Science+Business Media B.V. 2010</rights><rights>Springer Science+Business Media B.V. 2011</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c468t-902867a95721319e2be51c092cc4975626011d7035b58547b67cc37983e3d0663</citedby><cites>FETCH-LOGICAL-c468t-902867a95721319e2be51c092cc4975626011d7035b58547b67cc37983e3d0663</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11250-010-9668-1$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11250-010-9668-1$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,778,782,27911,27912,41475,42544,51306</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20680443$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ahmad, Ejaz</creatorcontrib><creatorcontrib>Ahmad, Nasim</creatorcontrib><creatorcontrib>Naseer, Zahid</creatorcontrib><creatorcontrib>Aleem, Muhammad</creatorcontrib><creatorcontrib>Khan, Muhammad Sarwar</creatorcontrib><creatorcontrib>Ashiq, Muhammad</creatorcontrib><creatorcontrib>Younis, Muhammad</creatorcontrib><title>Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls</title><title>Tropical animal health and production</title><addtitle>Trop Anim Health Prod</addtitle><addtitle>Trop Anim Health Prod</addtitle><description>The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 months of age). Bulls were evaluated for SC, BW, and NP. Semen was evaluated once a week for five consecutive weeks from regularly collected donor bulls (
n
= 86) ranging in age from 25–30 to >100 months. Ejaculate volume, sperm motility, sperm concentration, sperm morphology, percent live sperms, sperm plasma membrane integrity, and normal acrosome were compared among different age groups. Mean SC and BW increased (
P
< 0.05) in a curvilinear manner from birth to >100 months of age. Mean NP of testicular ultrasonograms increased (
P
< 0.05) from 0 to 24 months and then plateaued until >100 months of age. Body weight, SC, and NP were positively correlated with age from birth until >100 months (
r
= 0.91, 0.87, and 0.40, respectively). Ejaculate volume (5.7 ± 0.2 vs. 4.6 ± 0.09 ml) and sperm concentration (1,281.6 ± 17.7 vs. 1,115.8 ± 55.9 × 10
6
/ml) increased (
P
< 0.05) in mature bulls compared to younger ones. However, motility (68.6 ± 0.3%), plasma membrane integrity (50.8 ± 1.0%), and normal acrosome (74.8 ± 0.5%) remained insignificant due to age. In six of eight age groups studied, morphological abnormalities were well within the range (18.1 ± 0.3%). In conclusion, the BW, SC, and NP of testicular ultrasonograms, ejaculate volume, and concentration increased with age. Moreover, semen quality is fairly independent of age except volume and concentration in Sahiwal bulls.</description><subject>Acrosomes</subject><subject>Age</subject><subject>Age Factors</subject><subject>Animals</subject><subject>Biomedical and Life Sciences</subject><subject>Birth</subject><subject>Body weight</subject><subject>Body Weight - physiology</subject><subject>Cattle - anatomy & histology</subject><subject>Cattle - physiology</subject><subject>Life Sciences</subject><subject>Linear Models</subject><subject>Male</subject><subject>Motility</subject><subject>Organ Size</subject><subject>Original Research</subject><subject>Pakistan</subject><subject>Plasma membranes</subject><subject>Scrotum - anatomy & histology</subject><subject>Semen</subject><subject>Semen Analysis</subject><subject>Sperm</subject><subject>Testes</subject><subject>Testis - diagnostic imaging</subject><subject>Ultrasonography</subject><subject>Veterinary Medicine/Veterinary Science</subject><subject>Zoology</subject><issn>0049-4747</issn><issn>1573-7438</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNqFkUuLFDEURoMoTjv6A9xIcOOmS_OqPJYy-IIBwcc6pFLp7gyppCcPxv73puhRQRAXSRb33C-5OQA8x-g1Rki8KRiTEQ0Io0FxLgf8AGzwKOggGJUPwQYhpgYmmLgAT0q5QR1Ekj8GFwRxiRijG_Djiwum-hTLwR9h2kGzd7AmOKX5BO-c3x_qFhabUzUBWp9tW3Yuu2jdFlZXqrctmAxbqNmUFNM-m6VsoYkzLG5xEd42E3w9QR_hV3Pwdz1maiGUp-DRzoTint2fl-D7-3ffrj4O158_fLp6ez1YxmUdFCKSC6NGQTDFypHJjdgiRaxlSoyccITxLBAdp1GOTExcWEuFktTRGXFOL8Grc-4xp9vWX6wXX6wLwUSXWtFSUcL7hv9P4lHxvkQnX_5F3qSWYx9jhYgiVK5x-Az1zyslu50-Zr-YfNIY6VWfPuvT3Ype9em158V9cJsWN__u-OWrA-QMlF6Ke5f_3Pzv1J-vxaQz</recordid><startdate>20110101</startdate><enddate>20110101</enddate><creator>Ahmad, Ejaz</creator><creator>Ahmad, Nasim</creator><creator>Naseer, Zahid</creator><creator>Aleem, Muhammad</creator><creator>Khan, Muhammad Sarwar</creator><creator>Ashiq, Muhammad</creator><creator>Younis, Muhammad</creator><general>Springer Netherlands</general><general>Springer Nature B.V</general><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>3V.</scope><scope>7QL</scope><scope>7T7</scope><scope>7U7</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>P64</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>7X8</scope></search><sort><creationdate>20110101</creationdate><title>Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls</title><author>Ahmad, Ejaz ; Ahmad, Nasim ; Naseer, Zahid ; Aleem, Muhammad ; Khan, Muhammad Sarwar ; Ashiq, Muhammad ; Younis, Muhammad</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c468t-902867a95721319e2be51c092cc4975626011d7035b58547b67cc37983e3d0663</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Acrosomes</topic><topic>Age</topic><topic>Age Factors</topic><topic>Animals</topic><topic>Biomedical and Life Sciences</topic><topic>Birth</topic><topic>Body weight</topic><topic>Body Weight - physiology</topic><topic>Cattle - anatomy & histology</topic><topic>Cattle - physiology</topic><topic>Life Sciences</topic><topic>Linear Models</topic><topic>Male</topic><topic>Motility</topic><topic>Organ Size</topic><topic>Original Research</topic><topic>Pakistan</topic><topic>Plasma membranes</topic><topic>Scrotum - anatomy & histology</topic><topic>Semen</topic><topic>Semen Analysis</topic><topic>Sperm</topic><topic>Testes</topic><topic>Testis - diagnostic imaging</topic><topic>Ultrasonography</topic><topic>Veterinary Medicine/Veterinary Science</topic><topic>Zoology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ahmad, Ejaz</creatorcontrib><creatorcontrib>Ahmad, Nasim</creatorcontrib><creatorcontrib>Naseer, Zahid</creatorcontrib><creatorcontrib>Aleem, Muhammad</creatorcontrib><creatorcontrib>Khan, Muhammad Sarwar</creatorcontrib><creatorcontrib>Ashiq, Muhammad</creatorcontrib><creatorcontrib>Younis, Muhammad</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Toxicology Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Agricultural Science Collection</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Public Health Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>ProQuest Biological Science Collection</collection><collection>Agricultural Science Database</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biological Science Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>MEDLINE - Academic</collection><jtitle>Tropical animal health and production</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ahmad, Ejaz</au><au>Ahmad, Nasim</au><au>Naseer, Zahid</au><au>Aleem, Muhammad</au><au>Khan, Muhammad Sarwar</au><au>Ashiq, Muhammad</au><au>Younis, Muhammad</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls</atitle><jtitle>Tropical animal health and production</jtitle><stitle>Trop Anim Health Prod</stitle><addtitle>Trop Anim Health Prod</addtitle><date>2011-01-01</date><risdate>2011</risdate><volume>43</volume><issue>1</issue><spage>159</spage><epage>164</epage><pages>159-164</pages><issn>0049-4747</issn><eissn>1573-7438</eissn><abstract>The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 months of age). Bulls were evaluated for SC, BW, and NP. Semen was evaluated once a week for five consecutive weeks from regularly collected donor bulls (
n
= 86) ranging in age from 25–30 to >100 months. Ejaculate volume, sperm motility, sperm concentration, sperm morphology, percent live sperms, sperm plasma membrane integrity, and normal acrosome were compared among different age groups. Mean SC and BW increased (
P
< 0.05) in a curvilinear manner from birth to >100 months of age. Mean NP of testicular ultrasonograms increased (
P
< 0.05) from 0 to 24 months and then plateaued until >100 months of age. Body weight, SC, and NP were positively correlated with age from birth until >100 months (
r
= 0.91, 0.87, and 0.40, respectively). Ejaculate volume (5.7 ± 0.2 vs. 4.6 ± 0.09 ml) and sperm concentration (1,281.6 ± 17.7 vs. 1,115.8 ± 55.9 × 10
6
/ml) increased (
P
< 0.05) in mature bulls compared to younger ones. However, motility (68.6 ± 0.3%), plasma membrane integrity (50.8 ± 1.0%), and normal acrosome (74.8 ± 0.5%) remained insignificant due to age. In six of eight age groups studied, morphological abnormalities were well within the range (18.1 ± 0.3%). In conclusion, the BW, SC, and NP of testicular ultrasonograms, ejaculate volume, and concentration increased with age. Moreover, semen quality is fairly independent of age except volume and concentration in Sahiwal bulls.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><pmid>20680443</pmid><doi>10.1007/s11250-010-9668-1</doi><tpages>6</tpages></addata></record> |
fulltext | fulltext |
identifier | ISSN: 0049-4747 |
ispartof | Tropical animal health and production, 2011-01, Vol.43 (1), p.159-164 |
issn | 0049-4747 1573-7438 |
language | eng |
recordid | cdi_proquest_miscellaneous_893268931 |
source | MEDLINE; Springer Nature - Complete Springer Journals |
subjects | Acrosomes Age Age Factors Animals Biomedical and Life Sciences Birth Body weight Body Weight - physiology Cattle - anatomy & histology Cattle - physiology Life Sciences Linear Models Male Motility Organ Size Original Research Pakistan Plasma membranes Scrotum - anatomy & histology Semen Semen Analysis Sperm Testes Testis - diagnostic imaging Ultrasonography Veterinary Medicine/Veterinary Science Zoology |
title | Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-15T17%3A12%3A20IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Relationship%20of%20age%20to%20body%20weight,%20scrotal%20circumference,%20testicular%20ultrasonograms,%20and%20semen%20quality%20in%20Sahiwal%20bulls&rft.jtitle=Tropical%20animal%20health%20and%20production&rft.au=Ahmad,%20Ejaz&rft.date=2011-01-01&rft.volume=43&rft.issue=1&rft.spage=159&rft.epage=164&rft.pages=159-164&rft.issn=0049-4747&rft.eissn=1573-7438&rft_id=info:doi/10.1007/s11250-010-9668-1&rft_dat=%3Cproquest_cross%3E815961597%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=815292381&rft_id=info:pmid/20680443&rfr_iscdi=true |