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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| Format: | Conference or Workshop Item |
| Language: | English |
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1984
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| Online Access: | http://psasir.upm.edu.my/id/eprint/17878/1/ID%2017878.pdf |
| _version_ | 1825946094573453312 |
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| author | Adam, A. Tan, H. S. Jamak, M. Eusof |
| author_facet | Adam, A. Tan, H. S. Jamak, M. Eusof |
| author_sort | Adam, A. |
| collection | UPM |
| 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. |
| first_indexed | 2024-03-06T07:41:42Z |
| format | Conference or Workshop Item |
| id | upm.eprints-17878 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:41:42Z |
| publishDate | 1984 |
| record_format | dspace |
| spelling | upm.eprints-178782015-01-05T01:48:18Z 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 |
| 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. |
| title | 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_short | 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 |
| topic | Dairy cattle - Feeding and feeds Sahiwal cattle |
| url | http://psasir.upm.edu.my/id/eprint/17878/1/ID%2017878.pdf |
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