Calf production by Angus-Hereford and Brahman-Hereford cows on two native rangeland forage systems.
Calf birth weights, weaning weights, and preweaning gain of Simmental-sired calves from Angus-Hereford (AH) and Brahman-Hereford (BH) F1 cows grazing native rangeland (NR) or native rangeland-complementary forage (NRCF) systems in the southern Great Plains mixed prairie were evaluated. Calves from AH dams were heavier (P < .001) at birth than calves from BH dams in both forage systems (40 and 37 kg, respectively). However, birth weights of calves from BH dams were 2 kg heavier (P < .001) in the NRCF fall-calving system. Calves in the NRCF system were 122 d older and heavier (P < .001) than the NR calves at weaning (343 and 256 kg, respectively). During the preweaning period, the NR calves gained faster (P < .001) than the NRCF calves. When calves from both systems were evaluated at 200 d of age, NR calves were heavier (P < .001) than NRCF calves. Calves from BH cows were 8 to 16 kg heavier (P < .001) that calves from AH cows at 200 d of age and at weaning. The increased age at weaning associated with the NRCF did not reduce reproductive efficiency. The NRCF system requires less land than a traditional NR system to support a cow-calf pair and seems to be more economically efficient.
Sims
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Southern Plains Range Research Station, ARS, USDA, Woodward, OK 73801, USA.
Bailey
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D000821:Animal Feed / Q000592:standards*; D000818:Animals; D001724:Birth Weight / Q000502:physiology; D001947:Breeding; D002417:Cattle / Q000235:genetics / Q000502:physiology*; D005260:Female; D005527:Food, Fortified; D005838:Genotype; D008297:Male; D011247:Pregnancy; D018873:Pregnancy Rate; D012098:Reproduction / Q000502:physiology; D014481:United States; D015430:Weight Gain / Q000502:physiology