Risk factors for and reproductive outcomes of phantom cows on New Zealand dairy farms.
作者： EL Cuttance , WA Mason
DOI: 10.1080/00480169.2015.1031292
关键词:
摘要: AIMS: To determine some of the risk factors for cows not observed in oestrus within 35–42 days an unsuccessful artificial insemination (AI; phantom cows), and reproductive outcomes effect treatment cows.MATERIALS AND METHODS: Over 2 years, dairy herds from Waikato (n=10) Canterbury (n=4) regions New Zealand, pregnancy diagnosis was carried out after AI on that had been inseminated first 3 weeks start mating (PSM) but seen returning to oestrus. Risk were analysed using a generalised linear mixed model.In Year 1, all left untreated. In 2, categorised as having corpus luteum (CL) (CL+ n=120), or ovarian follicles ≥10 (n=101) <10 (n=40) mm diameter. Cows with CL treated cloprostenol untreated placed bulls. no received intravaginal progesterone (P4) 7 days, injection gonadotrophin-releasin...
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