Carcass and non-carcass component yields of crossbred Boer and Brazilian semiarid indigenous goats subjected to different feeding levels

Abstract

The effect of different feeding levels (ad libitum, 25 and 50 % restriction) and genotypes (½ Boer × ½ nondescript breed goats, Canindé, and Moxotó) on carcass quantitative characteristics and non-carcass components (NCC) were evaluated. Forty-five intact male goats were distributed in a 3 × 3 factorial design with five replicates. There was no effect of genotype on carcass weights and yields and retail cuts weights and yields (P > 0.05). Compared to Moxotó, ½ Boer presented better carcass conformation and higher weights (P < 0.01) and yields of viscera from gastrointestinal tract (P < 0.05), and compared to the other genotypes (P < 0.01), ½ Boer presented larger carcass compactness. Carcass weights and yields, retail cuts weights and NCC, and soft tissues yields were higher (P < 0.01) in goats fed ad libitum. The two restriction levels did not differ (P > 0.05) for these variables. There were interactions of genotype and feeding level. At ad libitum feeding, ½ Boer had higher weights of breast and shank, leg, soft tissues, and gastrointestinal viscera compared to the Moxotó (P < 0.05). The crossing of nondescript breed goats with Boer may be a strategy for increasing the efficiency of goat meat production in the Brazilian semiarid. Moreover, in times of feed scarcity, farmers may use higher feed restriction levels to keep animals, since for most of the parameters evaluated, there were no differences between the restriction levels.

Genotype effects on energy and protein requirements in growing male goats

“…The NRC (2007) recommends metabolizable protein requirements for growth 39% greater for meat goats than dairy and indigenous type, which may be due to differences in NP g and/or in k pg , as previously mentioned. One may think that in each kilogram gained, meat-type goats have more protein than indigenous or dairy goats (Warmington and Kirton, 1990;Gibb et al, 1993;Cameron et al, 2001;Martins et al, 2014); however, we did not observe such pattern in the present work. The goat database used to derive recommendations by the AFRC (1998) encompasses mainly data from castrated dairy goats, which may explain the lower protein requirements for gain.…”

Carcass characteristics of Canindé goats subjected to feed restriction

“…Animals with a greater slaughter weight tended to exhibit greater values for carcass measurements (Table 1). MARTINS et al (2014) observed that in Boer, Canindé and Moxotó kids fed ad libitum, there was an increase of the carcass internal length, chest depth and rump circumference in comparison with kids subjected to 25% and 50% feed restriction. DHANDA et al (2003) also reported an increase of carcass length according to the increase in the weight at slaughter in distinct breeds (Boer, Angorá, Feral and Saanen), slaughtered at intervals of 14-22kg and 30-35kg.…”

Desempenho produtivo e características de carcaça de cordeiros Rabo Largo puro e cruzados com Santa Inês

“…Os cordeiros F 1 SI x RL apresentaram maiores pesos de sangue, trato gastrointestinal cheio, conteúdo gastrintestinal e pulmão+traquéia em relação ao RL. Contudo, não houve influência no rendimento de carcaça, mas é necessário considerar além do porte, a maturidade dos animais (Martins, 2014) …”