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Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy

Postpartum ovarian function was determined by milk progesterone radioimmunoassay in 21 first-calf Sahiwal-Friesian cows assigned to one of three treatment groups designated as low, medium and high energy levels (n=7). The progesterone concentrations in defatted milk were determined thrice weekly...

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Yazar: Mohd. Adam, Azillah
Materyal Türü: Tez
Dil:English
Baskı/Yayın Bilgisi: 1984
Konular:
Cattle - Reproduction
Cattle - Breeding
Cattle - Physiology
Online Erişim:http://psasir.upm.edu.my/id/eprint/85596/1/FPV%201984%201%20ir.pdf
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spelling oai:psasir.upm.edu.my:85596 http://psasir.upm.edu.my/id/eprint/85596/ Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy Mohd. Adam, Azillah Postpartum ovarian function was determined by milk progesterone radioimmunoassay in 21 first-calf Sahiwal-Friesian cows assigned to one of three treatment groups designated as low, medium and high energy levels (n=7). The progesterone concentrations in defatted milk were determined thrice weekly for 120 days postpartum. Mean interval to resumption of ovarian activity and to forst ovulation was longest in the low energy group and shortest in the high energy group. Using progesterone concentration of > 1 ng/ml as criteria for corpus luteum activity, first ovulation occurred at 37.7 ± 18.0,26.6;t 15.7and25.3 ± 8.4 days for low, medium and high energy groups, respectively. However, first estrus was observed at 28.0 ± 21.6, 32.7:t 9.8 arid 25.4:t 6.0 days, respectively. The percentages of silent estrus were 13.6 percent, 29.6 percent and 14.3 percent for low, medium and high energy groups, respectively, with a majority ( 46.7 percent) detected during the initial postpartum estrous cycle. Interval to first insemination was longest in the low energy group, being 68.6·± 10.3,62.6 ± 18.1 and 56.6 ± 8.1 days for lOIN, medium and high energy groups, respectively. However, services per conception were 1.1, 1.7 and 3.3, respectively. Interval to conception was shortest in the low energy group, being 74.3 ± 14.9, 79.1 ± 17.3 and 88.3 ± 30.4 days for low, medium and high energy groups, respectively. The corresponding first service conception rates were 85.7 percent, 42.9 percent and 42.9 percent. Although a trend was detected, the differences were not statistically significant (p> 0.05) between the groups on the reproductive parameters analysed. In summary, low energy intake may delay the resumption of postpartum ovarian activity and ovulation in Sahiwal-Friesian cows. Mean interval from calving to conception, however, was not significantly different amongst the three groups if breeding commenced after 60 days postpartum. A higher incidence of silent estrus was detected during the initial estrous cycles after calving. Lastly, milk progesterone radioimmunoassay is a useful tool for estrus confirmation, early pregnancy diagnosis and assessment of fertility in postpartum cows. 1984-04 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/85596/1/FPV%201984%201%20ir.pdf Mohd. Adam, Azillah (1984) Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy. Masters thesis, Universiti Putra Malaysia. Cattle - Reproduction Cattle - Breeding Cattle - Physiology
institution UPM IR
collection UPM IR
language English
topic Cattle - Reproduction
Cattle - Breeding
Cattle - Physiology
spellingShingle Cattle - Reproduction
Cattle - Breeding
Cattle - Physiology
Mohd. Adam, Azillah
Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
description Postpartum ovarian function was determined by milk progesterone radioimmunoassay in 21 first-calf Sahiwal-Friesian cows assigned to one of three treatment groups designated as low, medium and high energy levels (n=7). The progesterone concentrations in defatted milk were determined thrice weekly for 120 days postpartum. Mean interval to resumption of ovarian activity and to forst ovulation was longest in the low energy group and shortest in the high energy group. Using progesterone concentration of > 1 ng/ml as criteria for corpus luteum activity, first ovulation occurred at 37.7 ± 18.0,26.6;t 15.7and25.3 ± 8.4 days for low, medium and high energy groups, respectively. However, first estrus was observed at 28.0 ± 21.6, 32.7:t 9.8 arid 25.4:t 6.0 days, respectively. The percentages of silent estrus were 13.6 percent, 29.6 percent and 14.3 percent for low, medium and high energy groups, respectively, with a majority ( 46.7 percent) detected during the initial postpartum estrous cycle. Interval to first insemination was longest in the low energy group, being 68.6·± 10.3,62.6 ± 18.1 and 56.6 ± 8.1 days for lOIN, medium and high energy groups, respectively. However, services per conception were 1.1, 1.7 and 3.3, respectively. Interval to conception was shortest in the low energy group, being 74.3 ± 14.9, 79.1 ± 17.3 and 88.3 ± 30.4 days for low, medium and high energy groups, respectively. The corresponding first service conception rates were 85.7 percent, 42.9 percent and 42.9 percent. Although a trend was detected, the differences were not statistically significant (p> 0.05) between the groups on the reproductive parameters analysed. In summary, low energy intake may delay the resumption of postpartum ovarian activity and ovulation in Sahiwal-Friesian cows. Mean interval from calving to conception, however, was not significantly different amongst the three groups if breeding commenced after 60 days postpartum. A higher incidence of silent estrus was detected during the initial estrous cycles after calving. Lastly, milk progesterone radioimmunoassay is a useful tool for estrus confirmation, early pregnancy diagnosis and assessment of fertility in postpartum cows.
format Thesis
author Mohd. Adam, Azillah
author_facet Mohd. Adam, Azillah
author_sort Mohd. Adam, Azillah
title Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
title_short Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
title_full Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
title_fullStr Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
title_full_unstemmed Postpartum ovarian activity in Sahiwal - Friesian cows fed different levels of energy
title_sort postpartum ovarian activity in sahiwal - friesian cows fed different levels of energy
publishDate 1984
url http://psasir.upm.edu.my/id/eprint/85596/1/FPV%201984%201%20ir.pdf
_version_ 1819300090366394368
score 13.4562235

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