Hatvani Csilla, Balogh Orsolya G, Endrődi Tamás, Abonyi-Tóth Zsolt, Holló István, Kastelic John P, Gábor György
Agri-Industrial Company of Bácsalmás, Hungary (Hatvani); Research Institute for Animal Breeding and Nutrition, Gesztenyés str. 1, Herceghalom, Hungary (Balogh, Gábor); Dennis Gábor Applied University, Budapest, Hungary (Endrődi); Faculty of Veterinary Science, Szent István University, Budapest, Hungary (Abonyi-Tóth); Faculty of Animal Science, University of Kaposvár, Kaposvár, Hungary (Holló); Agriculture and Agri-Food Canada, Lethbridge Research Centre, Lethbridge, Alberta (Kastelic).
Can J Vet Res. 2013 Jul;77(3):218-20.
The objective of this study was to determine rates of estrus and conception in lactating multiparous Holstein cows given 500 μg of cloprostenol intramuscularly after detection of the following ≥ 60 d after parturition: a solid corpus luteum (CL), a CL with a nonechodense cavity ≤ 20 mm in diameter (CLcav), a luteal cyst (cavity > 20 mm in diameter and a luteinized wall > 3 mm in diameter), or a follicular cyst (cavity > 20 mm and a luteinized wall ≤ 3 mm in diameter). The estrus rates were 335/419 (80.0%), 183/223 (82.1%), 170/182 (93.4%), and 44/87 (50.6%), respectively (P < 0.0001), and the conception rates 30 to 36 d after insemination among the estrous cows with an apparently normal mucus discharge were 130/285 (45.6%), 44/141 (31.2%), 39/79 (49.4%), and 19/30 (63.3%), respectively (P < 0.002). Compared with a solid CL, a CLcav did not affect the estrus rate but significantly reduced the conception rate (P < 0.05), and the estrus rates were significantly higher and lower in cows with a luteal or follicular cyst, respectively (P < 0.05).
本研究的目的是确定在分娩后≥60天检测到以下情况后，对经产泌乳荷斯坦奶牛肌肉注射500μg氯前列醇时的发情率和受孕率：坚实黄体（CL）、直径≤20mm的无回声腔黄体（CLcav）、黄体囊肿（直径>20mm且黄体化壁直径>3mm）或卵泡囊肿（直径>20mm且黄体化壁直径≤3mm）。发情率分别为335/419（80.0%）、183/223（82.1%）、170/182（93.4%）和44/87（50.6%）（P<0.0001），在精液排出明显正常的发情母牛中，授精后30至36天的受孕率分别为130/285（45.6%）、44/141（31.2%）、39/79（49.4%）和19/30（63.3%）（P<0.002）。与坚实黄体相比，CLcav不影响发情率，但显著降低受孕率（P<0.05），黄体囊肿或卵泡囊肿的母牛发情率分别显著更高或更低（P<0.05）。
