Detection of Oestrus in Bunaji Cows under Field Conditions |
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Authors: | Mai HM Ogwu D Eduvie LO Voh AA |
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Institution: | (1) Animal Production Programme, School of Agriculture, Abubakar Tafawa Balewa University, Bauchi, Nigeria;(2) Department of Veterinary Surgery and Medicine, Ahmadu Bello University, Zaria, Nigeria;(3) National Animal Production Research Institute, Ahmadu Bello University, Shika, Zaria, Nigeria |
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Abstract: | The objective of this study was to determine the efficacy of some aids for detectiong oestrus in 72 Bunaji cows synchronized using two injections of prostaglandin F2 (PGF2 ) 13 days apart. Blood samples to determine the accuracy of the aids and ovarian activity by radioimmunoassay technique were collected daily from the day of the second PGF2 injection until oestrus or for 168 hours for `non-responders'. The aids for detecting oestrus, tail painting, KaMar detectors and a chin-ball mating device (CMD) were applied at the time of the second injection.The oestrus response rate was 73.6% and 61.1%, from the serum progesterone concentration and visual observation, respectively. Based on the total number of oestrus events observed, unaided visual observation, tail painting, KaMar and CMD detected 52.2%, 82.6%, 82.6% and 76.8%, respectively. Visual observation of standing oestrus alone failed to detect 47.8% of the occurrence of oestrus as shown by the concentration of progesterone in the serum and 30.4%, 30.4% and 24.6%, respectively, of the oestrus periods recorded by tail painting, KaMar and CMD. Twenty-eight cows showed abnormalities in progesterone concentration.These investigations showed that oestrus may be detected by using the aids in cows that have been regarded as `anoestrous' by visual observation of standing heat. |
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Keywords: | chin-ball mating device cows KaMar detector oestrus prostaglandin tail paint Zebu |
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