The reproductive performance mothering ability and productivity of cross bred and tswana beef cows in botswana

Light, D.; Buck, N.G.; Lethola, L.L.

Animal Production 35(3): 421-426

1982


ISSN/ISBN: 0003-3561
Accession: 006753765

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Abstract
The calving rates, survival and growth of calves of Brahman (344), Bonsmara (454), Simmental (601) and Tuli (276) crossbred cows, and pure Tswana (405), were collected for a 7-yr period, 1974-1980. Calving and survival rates for calves were 0.90, 0.88, 0.87, 0.87 and 0.82; and 0.94, 0.93, 0.96, 0.94 and 0.93, for Simmental, Tuli, Brahman and Bonsmara crossbreds and pure tswana, respectively. These differences were not significant (P < 0.05). Calves produced by Simmental .male. and Bonsmara .male. crossbred cows were significantly heavier than those from Brahman .male. and Tuli .male. crossbred cows (P < 0.01), but not from Tswana-sired calves. At weaning, calves from Simmental-cross cows weighed 214 kg, significantly heavier than those produced by any other cow type (P < 0.01). Bonsmara- and Brahman-cross cows produced claves weighing 203 and 198 kg, respectively, at weaning, which were also significantly heavier than the calves of Tswana and Tuli crossbred cows (P < 0.01), which weighed 187 and 184 kg, respectively. Productivity estimates combining these 3 traits, and expressed as weight of calf weaned per cow per year, per kilogram cow weight and per kilogram metabolic weight of cow, demonstrate the advantages of 3 of the crossbred cow types over the pure Tswana. Recommendations for the further development of crossbreeding systems in Botswana are made on the basis of this finding.