An investigation of factors influencing synchronization response, conception and calving rate of communal cows in Limpopo Province, South Africa

Author: Z.C. Raphalalani, T.L. Nedambale, N.B. Nengovhela & K.A. Nephawe
Year: 2020
Issue: 1
Volume: 13
Page: 13 - 22

A study was designed to assess factors affecting response to oestrus synchronization, conception and calving rate of communal cows following timed artificial insemination (AI) in Limpopo province, South Africa. A total of 140 cows were selected from communal villages based on; body condition score (BCS) of 2 and above (1-5 scale), not pregnant (excluding heifers), 90 days’ post-partum, negative of contagious abortion (CA). A 9 day CIDR® protocol was used to synchronize the selected cows. The AI was done at 36 and 48 hours post synchronisation using Nguni frozen thawed semen. Pregnancy diagnosis was performed 90 days following AI. Data was analysed using logistic regression procedure of SAS. Cows that responded were 75%; of which 41% conceived and 36% calved. None of the factors such as district, age, parity, frame size and breed type significantly affect synchronization response and conception. However, BCS significantly affected calving rates. Small framed Nguni and Bonsmara type cows in their first parity with a BCS ≥3 had greater odds of conceiving to timed AI. In conclusion, acceptable oestrus synchronization response, conception and calving rate was achieved in communal setup regardless of BCS affecting calving. It is recommended that superior genetic materials can be successfully introduced through ARTs in organized communal production systems in South Africa. Raphalalani ZC_2020 Vol 13 (1)

Keywords: assisted reproductive technologies, Nguni, oestrus synchronization, timed artificial insemination
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