
handle: 11449/87984
It is common the use of feed restriction regimens for birds' weight control in broiler breeders farms. This study aimed to evaluate the effects that different feed restriction programs have on broiler breeder hens. A total of 832 Cobb 500® broiler breeder hens, 31 days old, were distributed into 32 boxes, each containing 26 birds, following a randomized block design with 4 treatments (T1 - (control) daily restriction, T2 - restriction skip-a-day T3 - Restriction 4/3 and T4 - Restriction 5/2), 8 replicates and two blocks (light and heavy birds). The birds were fed in order to achieve the same weight. The fertilization was done by natural mating. In the 11th, 18th, 25th, 32th, 39th and 46th weeks of age, 8 birds per treatment (1bird/pen) were killed to determine the relative weight of liver, ovary, oviduct and intestine. In the 32nd, 39th and 46th weeks of age, 96 eggs per treatment were collected and incubated prior to analysis of eclosion rate (EC) and hatchability (HT). Treatment 4/3 was the one that had better (3.33, p 0.05) for egg production from 25th to 43th week. It was found that the feed conversion per dozen eggs (FC / DZ) from hens of treatment 4/3 (0.84) was better (p 0.05) for age at sexual maturity (ASM), age at peak production (APP), number of eggs produced per bird (NE / BR), number of double yolked eggs (NDYE) and egg weight (EW)... (Complete abstract click electronic access below)
Em matrizeiros é comum a utilização de regimes de restrição alimentar para o controle de peso das aves. Objetivou-se com este trabalho avaliar os efeitos que diferentes programas de restrição alimentar têm sobre matrizes de corte. Foram utilizadas 832 matrizes pesadas Cobb 500® com 31 dias distribuídas em 32 boxes, contendo 26 aves cada, seguindo um delineamento em blocos casualizados com 4 tratamentos (T1 – (controle) restrição diária, T2 - restrição “skip-a-day”, T3 - restrição 4/3 e T4 - restrição 5/2), 8 repetições e dois blocos (aves leves e pesadas). As aves foram alimentas de forma a atingirem o mesmo peso. A fecundação foi feita por monta natural. Nas 11ª, 18ª, 25ª, 32ª, 39ª e 46ª semanas de idade foram abatidas 8 aves por tratamento (1 ave/box) para determinação do peso relativo de fígado, ovário, oviduto e intestino. Nas 32ª, 39ª e 46ª semanas de idade foram coletados e incubados 96 ovos por tratamento para análise de taxa de elcosão (TXEC) e eclodibilidade (ECLOD). O tratamento 4/3 foi o que obteve melhor (3,33; p0,05) para porcentagem de postura da 25ª a 43ª semana. Verificou-se que a conversão alimentar por dúzia de ovos (CA/DZ) das matrizes do tratamento 4/3 (0,84) foi melhor (p0,05) para idade à maturidade sexual (IMS), idade ao pico de postura (IPP)...
Pós-graduação em Zootecnia - FCAV
Fígado, Liver, Corpo - Peso, Frango de corte - Nutrição, Ovos - Eclodibilidade, Ovários
Fígado, Liver, Corpo - Peso, Frango de corte - Nutrição, Ovos - Eclodibilidade, Ovários
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