Madurez sexual e indicadores asociados en dos genotipos de gallinas bajo diferentes programas de alimentación

P. Sanz; M. Sindik; R. Fernández; F. Revidatti

doi:10.30972/vet.3124734

Authors

P. Sanz Cátedra Producción de Aves, Fac. Cs. Vet. UNNE, Cabral 2139, 3400, Corrientes (Argentina).
M. Sindik Cátedra Producción de Aves, Fac. Cs. Vet. UNNE, Cabral 2139, 3400, Corrientes (Argentina). INTA EEA Corrientes, Ruta 12 Km 1008, 3400, Corrientes (Argentina).
R. Fernández Cátedra Producción de Aves, Fac. Cs. Vet. UNNE, Cabral 2139, 3400, Corrientes (Argentina).
F. Revidatti Cátedra Producción de Aves, Fac. Cs. Vet. UNNE, Cabral 2139, 3400, Corrientes (Argentina).

DOI:

https://doi.org/10.30972/vet.3124734

Keywords:

hens, poultry, reproduction, management, restriction

Abstract

The aim of the present study was to evaluate body weight, corporal condition, zoometric indicators and age at sexual maturity in two genotypes of Campero INTA breeders under two raising feeding programs. We worked with 400 pullets from 2 genotypes (synthetic E and the hybrid ES*A) that received two nutritional levels (control and treated) between weeks 5 and 22. At 22 weeks a statistically significant interaction was observed (p<0,0001) for body weight. In the control group the birds of the ES*A genotype were heavier than the population E (ES*A 2,288 g vs. E 2,133 g), while in the treated group the birds of the genotype E were heavier than the population ES*A (ES*A 2,313 g vs. E 2,348 g). The comb index recorded significant differences between genotypes (p<0.0001) and feeding programs (p<0.0001). The feeding program induced an advance of the onset to sexual maturity in days for both populations (p=0.009), with values of 165 ± 2.83 (ES*A Control), 156 ± 2.83 (ES*A Treated), 164 ± 0.00 (E Control) and 157 ± 2.83 (E Treated). We concluded that different food assignments during the raising period impact on the body weight and the zoometric indicators in the maternal genotypes of the Campero INTA chicken and its crossings, with marked differences in the degree of integration between body weight and reproductive development between both genotypes. The higher allocation produces an advance at the entrance of sexual maturity.

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References

Brody T, Eitan Y, Soller M, Nir I, Nitsan Z. 1980. Compensatory growth and sexual maturity in broiler females reared under severe food restriction from day of hatching. British Poultry Sci 21: 437-446.

Decuypere E, Bruggeman V, Onagbesan O, Safi M. 1999. Endocrine physiology of reproduction in the female chicken: old wine in new bottles. Int Avian & Poultry Biol Rev 13: 145-153.

Eitan Y, Soller M, Rozenboim I. 1998. Comb size and estrogen levels toward the onset of lay in broiler and layer strain females under ad libitum and restricted feeding. Poultry Sci 77: 1593-1600.

Gregory N, Robins J. 1998.A body condition scoring system for layer hens. New Zealand J Agric Res 41: 555-559.

Johnson AL. 2000. Reproduction in the female. In: Sturkie’s Avian Physiology, 5º ed., Academics Press, p. 569.

Joseph NS, Robinson FE, Renema RA, Thorsteinson KA. 2003. Comb growth during sexual maturation in female broiler breeders. J Appl Poult Res 12: 7-13.

McGary S, Estevez I, Bakst M. 2003. Potential relationships between physical traits and male broiler breeder fertility. Poultry Sci 82: 328-337.

Rauw W, Kanis E, Noordhuizen SE, Grommers FJ. 1998. Undesirable side effects of selection for high production efficiency in farm animals: a review. Livestock Production Sci 56: 15-33.

Reddish JM. 2004. Evaluation of the effects of selection for increased body weight and increased yield on growth and development of poultry. Dissertation. Degree Doctor of Philosophy in The Ohio State University, 111 p.

Renema RA, Rustad ME, Robinson FE. 2007. Implications of changes to commercial broiler and broiler breeder body weight targets over the past 30 years. World’s Poultry Sci J 63: 457-472.

Steel R, Torrie J. 1988. Bioestadística: principios y procedimientos, McGraw-Hill/Interamericana, México.

Wright D et al. 2012. Onset of sexual maturity in female chickens is genetically linked to loci associated with fecundity and a sexual ornament. Reprod Domestic Anim 47: 31-36.