頁籤選單縮合
題 名 | Milk Progesterone Profiles in Various Reproductive States in Dairy Buffaloes under Field Conditions=不同生殖季節乳用水牛乳中助孕酮含量之田間試驗 |
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作 者 | Qureshi,Muhammad Subhan; Habib,Ghulam; Nawab,Gul; Siddiwqui,Muhammad Mohsin; Ahmad,Nazir; Samad,Hafiz Abdus; | 書刊名 | Proceedings of the National Science Council : Part B, Life Science |
卷 期 | 24:2 2000.04[民89.04] |
頁 次 | 頁70-75 |
分類號 | 437.399 |
關鍵詞 | 乳用水牛; 乳中助孕酮含量; Buffalo; Dairy; Pakistan; Reproduction; Hormone; Progesterone; |
語 文 | 英文(English) |
英文摘要 | Fifty-one dairy buffaloes in the last two months of gestation were selected at seven private peri-urban farms in the Peshawar district. Observations were recorded in buffaloes during normal (NBS, August to January) and low breeding seasons (LBS, February to July). After parturition, rectal examination of reproductive organs was carried out. Estrus detection was made through visual observation and the use of intact bul1. Postpartum ovulation was confirmed by ovarian palpation per rectum and milk progesterone levels (MPL), determined through radio-immunoassay. MPL was higher (p < 0.01) at various intervals in NBS calves (1.97 ?0.30 ng/ml) as compared to LBS calves (0.68 ?0.08 ng/ml). During LBS, MPL remained < 0.30 ng/ml up to the third fortnight and started rising later, reaching a peak of 1.27 ng/ml during the sixth fortnight. During NBS, there was a sharp rise in MPL during the second fortnight. reaching 3.64 ng/ml during the sixth fortnight. MPL was significantly different on different experimental farms (p < 0.01). MPL reached the lowest levels on the day of estrus (0.10 ng/ml), reached it? peak on day 7 and started declining on day 17 of estrus. MPL showed two postpartum elevations. In true anestrus buffaloes, MPL remained consistently low. However, in the anestrus period, silent ovu1ations were also noted, as reflected by increasing MPL without estrus signs. In pregnant buffaloes, MPL remained > 1 ng/ml. Results of the study showed that the low postpartum reproductive performance in dairy buffaloes during LBS was primarily due to inadequate functioning of the corpus luteum in secreting optimum concentrations of progesterone. The higher incidence of silent estrus during LBS indicated improved management for the detection of estrus. |
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