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Comparison of Oestrous Synchronization Response and Pregnancy Rate of Village Cows Following Timed Artificial Insemination in KwaZulu-Natal and Limpopo Provinces

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Open Journal of Animal Sciences 2016年第1期6卷 9-15页

作者： ayanda maqhashu Masindi L. Mphaphathi Mokgadi M. Seshoka Fhulufhelo V. Ramukhithi Frans L. Seolwana Matshidiso B. Masenya Thivhilaheli R. Netshirovha Mohleko H. Mapeka Nkhanedzeni B. Nengovhela Noel L. Kanuya Voster Muchenje Tshimangadzo L. Nedambale Agricultural Research Council Animal Production Institute Irene RSA Department of Livestock and Pasture Sciences University of Fort Hare Alice RSA Department of Veterinary Surgery and Theriogenology Faculty of Veterinary Medicine Sokoine University of Agriculture Morogoro Tanzania Department of Animal Wildlife and Grassland Sciences University of the Free State Bloemfontein RSA Department of Animal Sciences Tshwane University of Technology Pretoria RSA

The objectives of the current study were to evaluate the estrous response and pregnancy rate following timed artificial insemination (TAI) with frozen-thawed semen in cows. The study was carried out in cows at different villages of KwaZulu-Natal (KZN;n = 160) and Limpopo provinces (L;n = 171). Cows were selected randomly as presented by the farmers, regardless of parity, age, breed and body weight following pregnancy diagnosis. The cows were grouped according to breed type and body condition score (BCS) on a scale of 1-5. Selected cows were inserted a controlled intravaginal drug release (CIDR®) and removed on day 8, followed by administration of prostaglandin. Heat was observed on day 9 with the aid of heat mount detectors (HMD) that were placed on the individual cow’s tail head. Cows on heat were then inseminated twice at 12 hours interval. Pregnancy diagnosis was performed by an ultrasound scanner and rectal palpation 90 days after TAI. Data were analyzed using SAS 2006. Estrous responses were 100% in KZN and 99% in Limpopo. The lowest pregnancy rate was recorded in Brahman and Bonsmara type cows with BCS ≤ 2.5 regardless of province. Interestingly, Nguni type cows with BCS ≤ 2.5 had higher average pregnancy rate of 59.5% in Limpopo and 53.5% in KZN. However, cows with BCS ≥ 3 had better pregnancy rate regardless of breed type and province. In conclusion, village cows can be synchronized successfully and inseminated with frozen-thawed semen. However, pregnancy rates are low in cows with lower body condition. Village Nguni type cows were not affected by body condition scoring as they had higher and similar pregnancy rate as those that had body condition of ≥3.

关键词： Synchronization Village Cows Body Condition Score Pregnancy Diagnosis

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