Phenotypic relationship between body weight and subsequent milk production of Friesian-Bunaji halfbreds
Malau-Aduli, A.E.O., Abubakar, B.Y., Ajayi, G.S., Afolayan, R.A., Alawa, C.B.I., Lamidi, O.S., Barje, P.P., Dung, D.D., and Bawa, G.S. (1993) Phenotypic relationship between body weight and subsequent milk production of Friesian-Bunaji halfbreds. In: Proceedings of the 18th Annual Conference of the Nigerian Society for Animal Production. p. 109. From: 18th Annual Conference of the Nigerian Society for Animal Production, 21-25 March 1993, Owerri, Nigeria.
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Abstract
The study reported was conducted to investigate if fast growing heifers eventually become good milkers in a bid to assist dairy farmers in selecting their replacement stock at an early age. The data analysed consisted of body weight records at birth, 3, 6, 9 and 12 months of age of half-bred Friesian-Bunaji heifers as well as records on their subsequent lactation length, total lactation yield and estimated 305-day yield, collected over a twenty-three year period (1967-1989). Phenotypic correlations between body weights at fixed ages were all positive and highly significant (P<0.01), ranging from 0.30 to 0.79. The same trend was obtained for correlations among milk traits, the range being 0.74 to 0.95. Correlations between body weights and milk traits on the other hand, were very low and non-significant, ranging from 0.01 to 0.14. Equations fitted from simple, multiple and polynomial regressions of body weights on total lactation yield gave very low R-squared values. It was therefore concluded that body weights at birth, 3, 6, 9 and 12 months of age have little value in the prediction of future milk yield of Friesian-Bunaji heifers.
| Item ID: | 54956 |
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| Item Type: | Conference Item (Abstract / Summary) |
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| Date Deposited: | 09 Aug 2018 03:08 |
| FoR Codes: | 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 100% |
| SEO Codes: | 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830302 Dairy Cattle @ 100% |
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