Performance and characteristics of the carcass of goat mestizos nubiano anglian, to boer and goat without defined racial standard in pasture and confinement

The objective was evaluate the growth rate of different genetic kids, from birth to 270 days of age, to determine the most appropriate genotype to produce goat meat in the Northeast region of Brazil. The experiment was conducted on Vale do Curu Experimental farm, (Federal University of Ceará), state of Ceará, Brazil. During a period of 3 years (2002 - 2004), were evaluated a total of 207 kids from both sex corresponding to five genetic groups: ½ Anglo nubian x ½ SRD, ¾ Anglo nubian x ¼ SRD, ½ Boer x ½ SRD, ¾ Boer x ¼ SRD and native kids (without definition breed) - SRD. Kids were kept with their mothers until weaning, with approximately 90 days of age. In experiment one, the animals were maintained on native pasture until of 98 ha, with mineral supplementation and concentrated ration, during the dry period, however the birth weight of crossbreed kids were higher than the SRD. In experiment two e tree, it was evaluated the growth rate performance of different crossbreed kids in feedlot to determine the genetic type more efficient to weight gain. The experiments was carried out in the Zootecnia Department of Federal University of Ceará. Animals were maintained receiving in feedlot during a period of 60 days receiving a high energy diet, twice a day, constituted of 70% of concentrated and 30% of bulky (hay of grass elephant and of leucena). It was evaluated the total and daily weight gain, feed conversion, and the daily average consumption. The male kid goats presented highest numbers in the total and daily weight gain, feed conversion, and in the daily average consumption, compared to the female. In experiment three, the aim of this work was to study the carcass characteristics of crossbreed goats Anglo nubian, Boer and without defined breed-SRD slaughtered at different live weight. The goats were studied distributed in different genetic groups and three slaughter weights: 20, 25 and 30 kg of live weight, It was evaluated studies the yield and conformation carcass characteristics taking and comparing within groups of genotype and slaughter weight. Data were analyzed by the minimum squares method, using the procedure GLM (Lineal General Models) of SAS and means compare by ´t´ test. Yields and conformation of hot and cold carcass characteristics was significant superior (P 0,05). Experimento 3. Efeito do genótipo e do peso de abate sobre as características da carcaça de caprinos mestiços Anglo nubiano e Boer e Sem Padrão Racial Definido-SRD. No experimento foram estudadas as características da carcaça de cabritos de três grupos genéticos: ¾ Anglo nubiana, ¾ Boer e SRD, abatidos, dentro de cada grupo, com três diferentes pesos: 20, 25 e 30 kg. Avaliou-se as características de rendimento e conformação da carcaça, bem como as perdas por resfriamento, levando em consideração os efeitos do genótipo, peso e idade de abate e suas interações. Os resultados mostraram que não houve interação entre o genótipo e o peso de abate em todas as variáveis estudadas. O genótipo teve efeito significativo (P<0,05) no rendimento e conformação da carcaça, com os menores valores observados nos caprinos SRD, não havendo diferenças significativas entre os caprinos mestiços Anglo nubiano e Boer. O peso de abate influenciou também significativamente (P