Growth and slaughter traits of Boer × Spanish, Boer × Angora, and Spanish goats consuming a concentrate-based diet
M. R. Cameron, J. Luo, T. Sahlu, S. P. Hart, S. W. Coleman, and A. L. GoetschJournal of Animal Science. 79:1423–1430. 2001.
The number of Boer crossbred meat goats has been increasing rapidly, although how their growth and harvest traits compare with those of Spanish goats and influences of maternal genotype have not been thoroughly evaluated. This information would be useful to achieve optimal meat goat production systems and yield of goat products desired by consumers. Therefore, postweaning growth (9 to 24 weeks of age) and harvest traits (212 ± 5.0 days of age) of Boer × Spanish, Spanish, and Boer × Angora wethers consuming a concentrate-based diet were compared. Over the 16-week performance period, average daily gain (ADG), dry matter intake (DMI), and the ratio of ADG:DMI were greater for Boer crossbreds than for Spanish goats (ADG: 154, 117, and 161 g; DMI: 646, 522, and 683 g/day; ADG:DMI: 263, 235, and 261 g/kg for Boer × Spanish, Spanish, and Boer × Angora, respectively). Dressing percent (46.3, 47.3, and 47.0% of body weight) and quality grade score (11.17, 9.67, and 11.17 for Boer × Spanish, Spanish, and Boer × Angora, respectively; 12 = Choice +; 11 = Choice; 10 = Choice -; 9 = Good +) were similar among genotypes. Weights of some noncarcass components were greater for Boer crossbreds than for Spanish goats, but relative to empty BW, noncarcass component weights were similar among genotypes. Concentrations of moisture, ash, fat, and protein in carcass and noncarcass components did not differ among genotypes. Contributions to the carcass of different primal cuts were similar among genotypes, and there were few differences in concentrations of separated lean, bone, and fat in primal cuts. In conclusion, with consumption of a concentrate-based diet, postweaning growth from 9 to 24 weeks of age was greater for Boer crossbreds than for Spanish wether goats, with little or no difference between Boer × Spanish and Boer × Angora goats. Because of more rapid growth of Boer crossbreds than of Spanish goats, weights of the carcass and primal cuts were greater or tended to be greater for Boer crossbreds. However, relative to carcass or empty body weight, under production conditions similar to this experiment, slaughter and carcass variables should be similar for Boer × Spanish, Boer × Angora, and Spanish goats.
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