Metabolic disturbances in male broilers of different strains. 1. Performance, mortality, and right ventricular hypertrophy

Abstract

Two trials were carried out to test the susceptibility for metabolic disturbances of different strains of male broilers. In Trial 1, 1,890 male chickens were allotted in a randomized block design with seven treatments (Arbor Acres, Avian Farms, Cobb-500, Hubbard-Peterson, ISA, Naked Neck, and Ross) and six blocks of 45 chickens. Trial 2 involved 2,184 male chickens of six strains (Arbor Acres, Avian Farms, Cobb 500, Hubbard-Peterson, ISA Naked Neck, and Ross) allotted in seven complete blocks of 52 birds. The same management system was adopted for all birds, reared up to 42 d in an open house during late winter (Trial 1) or late autumn (Trial 2). The most marked differences observed among the strains tested was the lower BW and higher feed conversion of Naked Neck broilers. Total percentage mortalities were high among the most productive broilers, being more than 50% due to sudden death (SDS) and ascites syndrome (AS). No Naked Neck birds died as a consequence of these disturbances and the total mortalities were significantly lower (P < or = 0.05) than the other strains. The ratio of right ventricle weight to total ventricle weight of the dead birds was over 0.25, except for Naked Neck birds, which presented a nonhypertrophic ratio. The two trials confirmed the relationship between high productivity and high incidence of SDS and AS and indicated that Naked Neck male broilers are resistant to these metabolic disturbances.

Performance and Economic Suitability of Three Fast Growing Broiler Strains Raised Under Farming Condition in Bangladesh

“…The improved body weight gain of this strain, possibly due to higher feed intake and several other factors might be involved herewith. Our results are in agreement with the reports of several other previous researchers (Gonzales et al, 1998;Sarker et al, 2001Sarker et al, & 2002Abdullah et al, 2010), who found similar variations in rearing different strains under experimental conditions. The differences of the live weight and weight gain of the broiler strains may be explained by different factors, for example, genotype, feed, sex, strains, environmental conditions, climatic effects and so on.…”

“…The differences of the live weight and weight gain of the broiler strains may be explained by different factors, for example, genotype, feed, sex, strains, environmental conditions, climatic effects and so on. Gonzales et al (1998) found strain effects among several strains of birds in live weight. Korver et al (2004) reported that genotype may affect the body weight of different broiler strains.…”

Influência da forma física da ração e da linhagem sobre o desempenho e rendimento de cortes de frangos de corte

“…Segundo Havenstein et al (2003), de 1957 a 2001, o melhoramento genético foi responsável por 85% da evolução no desempenho de frangos de corte. Em conseqüência disso, trabalhos que avaliem linhagens são muito importantes pelo valor que o melhoramento genético tem no desenvolvimento da avicultura e em função da rapidez com que as mudanças ocorrem nesse segmento da avicultura.…”

Egg traits and physiological neonatal chick parameters from broiler breeder at different ages

“…Several studies have attempted to relate broiler chicken susceptibility to ascites after hatching to anatomical or physiological parameters like right ventricle:total ventricle weight, hematocrit, thyroid hormones, and blood viscosity (Maxwell et al, 1986;Julian, 1987;Silversides et al, 1997;Gonzales et al, 1998;Nir, 1998); however, there is no report in the literature showing if in neonatal chicks these parameters are related to breeder age. Thus, the objective of this study was to investigate how breeder age (30, 45 and 60 weeks) affects eggshell characteristics and blood, cardiac and lung parameters of neonatal chicks.…”