Magnitude and direction of genetic-environmental interaction in rabbits with special reference to live and slaughter performance and carcass cut-out

M.S. Ayyat, M.R. Anous

Abstract

The data were collected on sixty New Zealand White (NZW) and sixty Californian (CAL) weaned male rabbits used to investigate the magnitude and direction of genetic environmental mteraction. Ralf the rabbits in each group was fed ad libitum on commercial pelleted ration containing Zinc bacitracin (ZIN) and the other half on ration containing Flavomycin (FLA). For all rabbits, daily gain, daily feed intal<e and feed conversion rate were calculated for entire interval from weaning (O) to final weight (8 weeks) and sub-intervals (0-4 and 4-8 weeks). Half tlie rabbits in each breed-promoter type group (n = 15) were slaughtered after 8 weeks from weaning and evaluated for slaughter and carcass cut-out traits.

Significant interactions of bread with promoter type were delected fo carcass percentage and for the proportIon of the carcass weight occurring in the fore and hind limbs (P<0.05). The knowledge of such interaction may lead to recommend the specific use of FLA for NZW rabbits and the specific use of ZIN for CAL. Besides, the absence of interaction of bread with promoter type in terms of live performance and yield of non-limb carcass components lead to conclude that while the tastar gainer and more efficient feed converter bread (NZW) under one promoter type treatment was also the best under the other promoter type. NZW tended (P<0.01) under both types of promoters to have more proportion of the carcass weight occurring in the head and less proportion in the trunk.


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References

BERTA F., CAVA P.L., LADETT0 G., 1983. The use of Zinc bacitracin as a growth promoter in the diets of growing rabbits. Ann. Fac. Med. Vet. Torino, 29, 80-89.

BLASCO A., OUHAY0UN J., MASOERO G., 1992. Status of rabbit meat and carcass. Criteria and terminology. Options méditérranéennes, Séries Séminaires, 17, 105-120.

CASADY R.B., HAGEN K.W., SITTMANN K, 1964. Effect of high level antibiotic supplementation in the ration on growth and enteritis in young domestic rabbits. J. Anim. Sci., 23, 477-480. https://doi.org/10.2527/jas1964.232477x

C0MER0N N.D., CURRAN M.K., TH0MPS0N R., 1988. Estimation of sire with feeding regime interaction in pigs. Animal Production, 46, 87- 95. https://doi.org/10.1017/S0003356100003147

DAMIAN C., MARTINA G., CIUREL V., 1982. Effect of different amounts of Flavomycin in the feed of rabbits. Lucar. Sti. Inst. Cer. Nutrí. Anim., 11, 209-214.

DICKERS0N G.E., 1962. lmplication of genetic­environmental interaction in animal breeding. Animal Production, 4, 47-63. https://doi.org/10.1017/S0003356100034395

DUNCAN D.B., 1955. Multiple range and multiple F­tests. Biometrics, 11, 1-42. https://doi.org/10.2307/3001478

F0WLER S.H., ENSMINGER M.E., 1960. Lnteraction between genotype and plane on nutrition in selection for rate of gain in swine. J. Anim. Sci., 19, 434-441. https://doi.org/10.2527/jas1960.192434x

GREPPI G., R0SI F., C0RTI M., N0RDIO C., 1982. Performance of growing rabbits given balanced diets with supplements of Virginiamycin. Conigliocoltura, 12, 41-43.

KING J.O.L., 1966. Toe feeding of penicillin to rabbits. British Vet. J., 122, 112-116. https://doi.org/10.1016/S0007-1935(17)40701-9

KING J.O.L., 1976. Toe feeding of Zinc bacitracin to growing rabbits. The Veterinary record, 99, 507-508. https://doi.org/10.1136/vr.99.25-26.507

LEBAS F., 1992. Control of feeding in crossbreeding and breed comparison experiments with rabbits. Options Méditerranéennes, Série Séminaires, 17, 85-94.

M0RDENTI A, ZAGHINI G., 1979. Performance in Animal Production. Piana G and Piva G., ed., Milan, Smith Kline, 214-222.

OKERMAN F, 1982. Effect of Virginiamycin on growth, feed conversion efficiency and viability of meat rabbits. Revue de l'Agriculture, 33, 3039-3049.

OMTVEDT I.T., WHATLEY J.A.JR., WHITEMAN J.V., MARRIS0N R.D., 1982. Genotype-environment interactions in feed lot performance and carcass traits in swine.J. Anim. Sci., 21, 41-48. https://doi.org/10.2527/jas1962.21141x

SALMELA A.B., REMPLE W.E., C0MST0CK R.E., 1960. Toe reaction of three kinds of single-cross pigs to three levels of feed intake. 1. Feed lot performance. J. Anim. Sci., 19, 84-92. https://doi.org/10.2527/jas1960.19184x

SAS, 1982. SAS User's Guide : Statistics. Statistical SAS, 1982. SAS User's Guide : Statistics. Statistical

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 Universitat Politècnica de València

 

Official journal of the World Rabbit Science Association (WRSA)

 

e-ISSN: 1989-8886     ISSN: 1257-5011   https://doi.org/10.4995/wrs