Conception rates of cows inseminated with frozen semen of Rural Development Academy, Bogura, Bangladesh

Bangladesh Journal of Veterinary Medicine Pub Date : 2024-04-10 DOI:10.33109/bjvmjd2023fam3

Mehedi Hasan, Riazul Islam, Mashrufa Tanzin, N. Juyena, Mohammad Musharraf Uddin Bhuiyan

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Abstract

Background: The first service conception rate (FSCR) is an important parameter for any artificial insemination (AI) programme. The present study was conducted to determine the FSCR and its influencing factors in cows inseminated with frozen semen produced by Rural Development Academy, Bogura. Methods: Data were collected from 372 cows at 39 villages under Sherpur Upazilla of Bogura district on breed, age, body condition score (BCS), parity, milk yield, suckling, AI season and the interval between oestrus to AI using a questionnaire. Results: The overall FSCR of cows was 66.4% and the service per conception was 1.53. The FSCR was higher (74.1%) in local cows compared to the Holstein-Friesian (HF) cross counterpart (64.2%). The FSCR was higher (70.4%) in 24-47 months old cows compared to 84-98 months old counterpart (61.5%). The highest FSCR (81.6%) was observed in cows with 3.0 to 3.5 BCS and the lowest (25.7%) was observed in cows with 2.5 BCS. The highest FSCR (68.3%) was observed in the 0 (zero) parity (heifers) group of cows and the lowest (62.5%) was observed in the 4-7 parity counterpart. The highest FSCR (72.4%) was observed in cows yielded daily >15-22 L milk and the lowest (62.1%) was observed in cows yielded ≤5 L milk. The highest FSCR (72.7%) was observed in suckling restricted cows and the lowest (60.9%) was observed in cows that had several times suckling daily. The highest FSCR (72.1%) was observed in cows received inseminations in Rainy (July-October) season and the lowest (58.4%) was observed in cows received inseminations in Winter (November-February). The highest FSCR (67.1%) was observed in cows received inseminations between 12-18 hrs of detection of oestrus and the lowest (59.1%) was observed in cows received insemination between 8-11 hrs of detection of oestrus. However, the difference in FSCR in cows with different BCS groups was significant (p<0.01). Conclusion: The current FSCR in cows can be considered to be satisfactory. The BCS of cows significantly influences the FSCR in cows.

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孟加拉国博古拉农村发展学院奶牛冷冻精液受精的受孕率

背景：初配受胎率（FSCR）是人工授精（AI）计划的一个重要参数。本研究旨在确定使用博古拉农村发展学院生产的冷冻精液进行人工授精的奶牛的受胎率及其影响因素：方法：采用问卷调查的方式收集了博古拉县 Sherpur Upazilla 下 39 个村庄 372 头奶牛的数据，包括品种、年龄、体况评分 (BCS)、奇偶数、产奶量、哺乳期、人工授精季节以及从发情到人工授精的间隔时间：奶牛的总体受胎率为 66.4%，每次受孕的服务次数为 1.53 次。与荷斯坦-弗里斯兰（HF）杂交奶牛（64.2%）相比，本地奶牛的受胎率更高（74.1%）。24-47 月龄奶牛的繁殖后备母牛比率（70.4%）高于 84-98 月龄奶牛（61.5%）。BCS值为3.0-3.5的奶牛FSCR最高（81.6%），BCS值为2.5的奶牛FSCR最低（25.7%）。FSCR最高（68.3%）的母牛是0（零）奇数（母牛）组，最低（62.5%）的母牛是4-7奇数组。日产奶量大于 15-22 升的奶牛FSCR最高（72.4%），日产奶量小于5升的奶牛FSCR最低（62.1%）。哺乳受限的奶牛FSCR最高（72.7%），每天哺乳数次的奶牛FSCR最低（60.9%）。在雨季（7 月至 10 月）接受人工授精的奶牛FSCR最高（72.1%），在冬季（11 月至 2 月）接受人工授精的奶牛FSCR最低（58.4%）。发情12-18小时之间接受人工授精的奶牛FSCR最高（67.1%），发情8-11小时之间接受人工授精的奶牛FSCR最低（59.1%）。然而，不同BCS组奶牛的FSCR差异显著（P<0.01）：结论：目前奶牛的发情周期是令人满意的。结论：目前奶牛的发情周期可以被认为是令人满意的，奶牛的BCS对奶牛的发情周期有很大影响。

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Bangladesh Journal of Veterinary Medicine

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