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Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.

Progesterone (P4) concentration in 21 SahiwalxFriesian cows kept on three energy levels (n=7) were determined thrice weekly for 120 days after first calving using a simple direct radioimmunoassay in fat-free milk. Based on post-partum P4 profiles, resumption of ovarian activity (Mean ± S.D.) commenc...

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Xehetasun bibliografikoak
Egile Nagusiak: Adam, A., Tan, H. S., Jamak, M. Eusof
Formatua: Conference or Workshop Item
Hizkuntza:English
Argitaratua: 1984
Gaiak:
Dairy cattle - Feeding and feeds
Sahiwal cattle
Sarrera elektronikoa:http://psasir.upm.edu.my/id/eprint/17878/1/ID%2017878.pdf
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spelling oai:psasir.upm.edu.my:17878 http://psasir.upm.edu.my/id/eprint/17878/ Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake. Adam, A. Tan, H. S. Jamak, M. Eusof Progesterone (P4) concentration in 21 SahiwalxFriesian cows kept on three energy levels (n=7) were determined thrice weekly for 120 days after first calving using a simple direct radioimmunoassay in fat-free milk. Based on post-partum P4 profiles, resumption of ovarian activity (Mean ± S.D.) commenced at 32.9 ± 19.2, 22.4 ± 14.3 and 25.6 ± 8.8 days post-partum for low, medium and high energy groups, respectively. Using P4 levels of ≥ 1 ng/ml as a criterion for corpus luteum activity, first ovulation occured at 37.7 ± 18.0, 26.6 ± 15.7 and 25.3 ± 8.3 days post-partum, respectively. Although intervals to resumption of ovarian activity and to first ovulation were longer in the low energy group, these differences were not significant (P < 0.05). First observed oestrus was noted at 28.0 ± 21.6, 32.7 ± 9.8 and 25.4 ± 6.0 days post-partum for low, medium and high energy groups, with 13.6, 29.6 and 14.3% incidence of undetected oestrus, respectively. From P4 profiles, mean cycle length before conception of the three groups were 19.9 ± 4.1, 19.3 ± 3.8 and 20.9 ± 3.6 days, while the intervals from calving to conception were 74.3 ± 14.9, 79.1 ± 17.3 and 88.3 ± 30.4 days, respectively. A higher incidence of repeat breeding was observed in the high energy group although mean intervals to conception were not significantly different. 1984 Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/17878/1/ID%2017878.pdf Adam, A. and Tan, H. S. and Jamak, M. Eusof (1984) Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake. In: 8th MSAP Conference, 13-14 Mar. 1984, Genting Highlands. (pp. 173-180). Dairy cattle - Feeding and feeds Sahiwal cattle
institution UPM IR
collection UPM IR
language English
topic Dairy cattle - Feeding and feeds
Sahiwal cattle
spellingShingle Dairy cattle - Feeding and feeds
Sahiwal cattle
Adam, A.
Tan, H. S.
Jamak, M. Eusof
Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
description Progesterone (P4) concentration in 21 SahiwalxFriesian cows kept on three energy levels (n=7) were determined thrice weekly for 120 days after first calving using a simple direct radioimmunoassay in fat-free milk. Based on post-partum P4 profiles, resumption of ovarian activity (Mean ± S.D.) commenced at 32.9 ± 19.2, 22.4 ± 14.3 and 25.6 ± 8.8 days post-partum for low, medium and high energy groups, respectively. Using P4 levels of ≥ 1 ng/ml as a criterion for corpus luteum activity, first ovulation occured at 37.7 ± 18.0, 26.6 ± 15.7 and 25.3 ± 8.3 days post-partum, respectively. Although intervals to resumption of ovarian activity and to first ovulation were longer in the low energy group, these differences were not significant (P < 0.05). First observed oestrus was noted at 28.0 ± 21.6, 32.7 ± 9.8 and 25.4 ± 6.0 days post-partum for low, medium and high energy groups, with 13.6, 29.6 and 14.3% incidence of undetected oestrus, respectively. From P4 profiles, mean cycle length before conception of the three groups were 19.9 ± 4.1, 19.3 ± 3.8 and 20.9 ± 3.6 days, while the intervals from calving to conception were 74.3 ± 14.9, 79.1 ± 17.3 and 88.3 ± 30.4 days, respectively. A higher incidence of repeat breeding was observed in the high energy group although mean intervals to conception were not significantly different.
format Conference or Workshop Item
author Adam, A.
Tan, H. S.
Jamak, M. Eusof
author_facet Adam, A.
Tan, H. S.
Jamak, M. Eusof
author_sort Adam, A.
title Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
title_short Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
title_full Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
title_fullStr Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
title_full_unstemmed Post-partum milk progesterone profiles in SahiwalxFriesian cows on different energy intake.
title_sort post-partum milk progesterone profiles in sahiwalxfriesian cows on different energy intake.
publishDate 1984
url http://psasir.upm.edu.my/id/eprint/17878/1/ID%2017878.pdf
_version_ 1819294177713717248
score 13.4562235

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