Efeito Da Sexagem E Linhagens Sobre O Desempenho E Rendimento De Carcaça De Frangos De Corte

Abstract

ResumoRealizou-se este trabalho com o objetivo de avaliar o desempenho produtivo e o rendimento de carcaça de diferentes linhagens e sexagens de frangos de corte. Foram avaliadas 576 aves das linhagens Cobb, Ross e Hubbard, dispostas nas sexagem macho, fêmea ou misto, abatidas aos 45 dias de idade. Utilizou-se o delineamento inteiramente casualizado (DIC), num bifatorial 3 x 3 (linhagens x sexagem), com quatro repetições e 16 aves em cada tratamento. O peso vivo, ganho de peso, consumo de ração e conversão alimentar apresentaram diferenças significativas no decorrer das fases avaliadas, porém, mostraram-se semelhantes ao final do período avaliado. O desempenho dos machos apresentou superioridade em comparação com as fêmeas e os mistos. No rendimento de carcaça, não foi possível observar diferenças significativas entre as linhagens e sexagens das aves; no entanto, em alguns cortes nobres a linhagens Cobb apresentou melhores resultados. Palavras-chave: avicultura; genética; mercado consumidor; tecnologia. Abstract:We carried out this study to evaluate the productive performance and carcass yield of different strains and sexing of broilers. We evaluated 576 birds of Cobb, Ross, and Hubbard strains, arranged in male, female or mixed sexing, slaughtered at 45 days of age. We used a completely randomized design (CRD), in a 3 X 3 factorial (strain X sex), with four replicates per treatment. Body weight, weight gain, feed intake, and feed conversion showed significant differences in the course of the phases evaluated; however, they were similar at the end of the study period. Males showed superior results compared to females and mixed sexing. Carcass yield showed no significant differences among strains and sexing of birds; however, in some prime cuts, Cobb presented the best results.

Straight-run vs. sex separate rearing for 2 broiler genetic lines Part 1: Live production parameters, carcass yield, and feeding behavior

“…Estimated parameters for body weight (BW), feed intake (FI), feed conversion ratio (FCR), and body weight coefficient of variation (CV) predictive models of female, male, and straight-run birds, Ross 308 and Ross 708. estimate growth curves for birds raised sex separate. Not surprisingly, in the data presented here, males were heavier followed by straight-run birds and then females, which is consistent with most of the data present in the literature (Smith et al, 1954;Hess et al, 1960;Brake et al, 1993;Gous et al, 1999;May and Lott, 2001;Aggrey, 2002;de Albuquerque et al, 2006;Aggrey, 2009;Shim et al, 2012;Api, 2014;Zuidhof et al, 2014). The growth curve analysis revealed a higher maturity rate and an earlier in life inflection point for the females in comparison with males.…”

“…The interaction of genetic strains and rearing system on growth observed in the present experiment has been described previously in the literature (Hess et al, 1960;Lamoreux and Proudfoot, 1969;Api, 2014). Overall for both strains, males grew heavier and faster than straight-run and females.…”

“…Furthermore, no significant differences were observed by these authors on FCR when they averaged pens of males and females reared sex separate with pens reared straight-run. In a field survey using 141 flocks, Api (2014) observed the effects of raising birds of 3 genetic lines (Cobb, Ross, and Hubbard) under sex separate and straightrun regimes. No interactions of the genetic line and rearing system was observed on BW; however, the interaction of treatments was observed to be significant when FCR was the criteria evaluated, which is the complete opposite of the outcomes of the current experiment.…”

“…In terms of performance, some authors concluded that sex separation of the chicks did not show any benefits (Smith et al, 1954;Hess et al, 1960;Lang et al, 1960;Lamoreux and Proudfoot, 1969). On the contrary, there are some reports that clearly show benefits in terms of performance and bird uniformity at processing age by sex separation of the chicks (Becker and Berg, 1959;Deaton et al, 1973;Gehle et al, 1974;Laseinde and Oluyemi, 1994;de Albuquerque et al, 2006;Api, 2014). Regardless of the performance results, the effects on CV are very consistent across the reports, where overall CV are higher in straight-run flocks when comparing with sex separate (Becker and Berg, 1959;Hess et al, 1960;Lamoreux and Proudfoot, 1969;Deaton et al, 1973).…”

Efeito Do Sexo Sobre Desempenho Produtivo E Características De Carcaça De Frangos De Corte

“…Já no presente estudo, a conversão alimentar não diferiu (P>0,05) entre os sexos. Ao avaliarem o efeito da sexagem e linhagens sobre o desempenho e rendimento de carcaça de frangos de corte, Api et al (2017) observaram que os machos das linhagens Cobb 500 apresentaram melhores valores para peso vivo, ganho de peso e consumo de ração em relação às fêmeas.…”