A trail to grade New Zealand White rabbits for broiler production at marketing and breeding
Eighty healthy New Zealand White male rabbits, at marketing age (90 days), were used in this study. AII available measurements and their indices on the live animals with half of one standard deviation difference were used to classify the carcasses and their associated traits to definite classes according to fleshing and superiority of the prime cuts. With this aim in view, correlation coefficients between each pair of traits studied, coefficients of determination and prediction equations for sorne carcass traits by stepwise and simple methods, were estimated to define the 1mportant measurements in predicting mainly fleshing and prime cuts. Correlation coefficients between each pair of traits studied within each of the grades of live body weight (LBW)/thigh length (TL) and LBW/body length, were also calculated. Only the LBW/TL index succeeded in separation of the carcass traits and the associated body measurements to three grades. Within LBW/TL index, the mean traits and the edible meat were high in the first grade, followed by the second and third grades, respectively. The differences in traits between the various grades were highly significant (P<0.01). Within each of the grades of the same index, correlation coefficients between LBW and each of the high quality meat traits were generally high, positive and significant, and decrease from the first to the third grade, respectively.
AYYAT M.S., 1991. Growth and carcass production performance of growing rabbits as affected by dietary energy level. Zagazig J. Agr. Res., 18 (1), 110-122.
AYYAT M.S., 1994. Effect of different levels of dietary protein and copper on growth performance in rabbits. Egyptian J. Rabbit Sci., 4, 83-92.
BLASCO A., OUHAYOUN J., MASOERO G., 1992. Study of rabbit meat and carcass criteria and terminology. J. Appl. Rabbit Res., 15, 775-786.
CHEN C.P., RAO D.R., SUNKI G.R., JOHNSON W.M., 1978. Effect of weaning and slaughter ages upon rabbit meat production. 1. Body weight, feed efficiency and mortality. J. Anim. Sci., 46 (3), 573-577. https://doi.org/10.2527/jas1978.463573x
LUKEFAHR S.D., VAN VLECK L.D., ROBERTS J.D., 1992. Estimates of components of variance and covariance for carcass traits in rabbits using an animal model. J. Appl. Rabbit Res., 15, 259-273.
NIEDZWIADECK S., 1983. Phenotypic and genetic correlations among sorne production characters of New Zealand White rabbits. Roczaiki Naukowe Zootechniki, 10 (1), 37-45.
NRC, 1977. National Reseach Council Sub Committee on Animal Nutrition. Nutrient requirements of rabbits, National Academy of Science, Washington DC.
SAS, 1982. SAS User's guide. Statistical Analysis System Institute Inc. Cary, NC 27511.
SZENDRÖ Z., RADNAI l., BIRO-NEMETH E., ROMVARI R., 1994. Effect of liveweight on the carcass traits of Pannon White growing rabbits. Options Méditérranéennes, 8, 393-399.
Metrics powered by PLOS ALM
Official journal of the World Rabbit Science Association (WRSA)
e-ISSN: 1989-8886 ISSN: 1257-5011 https://doi.org/10.4995/wrs