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Growth of F-1Bos taurus X Bos indicus versus Bos indicus beef cattle in Venezuela. II. Initial, final, and carcass weight of bulls, and breeding weight of heifers



Growth of F-1Bos taurus X Bos indicus versus Bos indicus beef cattle in Venezuela. II. Initial, final, and carcass weight of bulls, and breeding weight of heifers



Journal of Animal Breeding and Genetics 112(2): 133-145



Animals produced from zebu cows using semen of Brahman (B, control), Charolais (C), Limousin (L), Marchigiana (M), Romosinuano (Criollo, R) and Simmental (S) in experiment 1 (E-1), and semen of B (control), Angus (A), Chianina (K), Gelbvieh (G), L and S in experiment 2 (E-2) were evaluated on two ranches in the Venezuelan floodplains. In E-1, initial weight (IW), average daily gain (ADG) during the finishing period, final weight (FW) and carcass weight (CW) were recorded in bulls, while FW in bulls and weight before the breeding season (SW) in heifers were recorded in E-2. After reaching 18 months of age, bulls were maintained on savanna and cultivated pasture, and, during the finishing period, on cultivated pasture. Heifers were maintained on savanna until breeding age. The following numbers of records were analysed by least-squares procedures: 1. In E-1: 1262 IW; 1261 ADG; 1269 FW; 1265 CW; 2. In E-2: 721 FW; 565 SW. In the model breed group, year and month of birth, sire within breed, year times month and age (linear and quadratic except in ADG) were were included. Breed group was highly significant and all crossbred groups were superior to Brahman at all weights. Adjusted means for IW, ADG, FW and CW in E-1 were 304.1 +- 2.3 kg (age 700 days), 742 +- 9 g (period of 229 days), 467.8 +- 3.2 kg (age 929 days) and 242.6 +- 1.7 kg (age 929 days), respectively. In E-2, adjusted means for FW and SW were 478.2 +- 1.9 kg (age 892 days) and 341.6 +- 2.4 kg (age 767 days), respectively. Mean superiority (and variation of means of extreme groups) of F-1 over B was: 1. In E-1: IW, 7.9 (4.5-10.2)%; ADG, 12.2 (6.3-14.5)%; FW, 9.1 (5.1-13.3)%; CW, 10.3 (7.3-13.5)%; 2. In E-2: FW 7.2 (4.5-9.8)%; SW 12.2 (10.6-14.4)%. In E-1, F-1 M and F-1 C were the best groups at all weights, and, for FW, these were F-1 K and F-1 S in E-2. The progeny of the best sire within breed for FW in E-1 and E-2 was 18.1 and 12.9% superior to that of the poorest. The average advantage of crossbreds over B in E-1 and E-2 was equivalent to 40 and 32 kg or 40 and 32 US , while these values for the best groups were 58 and 44 kg, or 58 and 44 US .

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