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...

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Veröffentlicht in:Tropical animal health and production 2011-01, Vol.43 (1), p.159-164
Hauptverfasser: Ahmad, Ejaz, Ahmad, Nasim, Naseer, Zahid, Aleem, Muhammad, Khan, Muhammad Sarwar, Ashiq, Muhammad, Younis, Muhammad
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container_title Tropical animal health and production
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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  
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The study was based on 128 Sahiwal bulls of different age groups (from 0 to &gt;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 &gt;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  &lt; 0.05) in a curvilinear manner from birth to &gt;100 months of age. Mean NP of testicular ultrasonograms increased ( P  &lt; 0.05) from 0 to 24 months and then plateaued until &gt;100 months of age. Body weight, SC, and NP were positively correlated with age from birth until &gt;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  &lt; 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. 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The study was based on 128 Sahiwal bulls of different age groups (from 0 to &gt;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 &gt;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  &lt; 0.05) in a curvilinear manner from birth to &gt;100 months of age. Mean NP of testicular ultrasonograms increased ( P  &lt; 0.05) from 0 to 24 months and then plateaued until &gt;100 months of age. Body weight, SC, and NP were positively correlated with age from birth until &gt;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  &lt; 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>
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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
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