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The effect of age at puberty on growth and carcass quality at market weight in the gilt

Published online by Cambridge University Press:  02 September 2010

M. A. Price
Affiliation:
Department of Animal Science, University of Alberta, Edmonton, Alberta T6G 2H1, Canada
F. X. Aherne
Affiliation:
Department of Animal Science, University of Alberta, Edmonton, Alberta T6G 2H1, Canada
J. I. Elliot
Affiliation:
Agriculture Canada Research Branch, Animal Research Institute, Ottawa, Ontario K1A 0C6, Canada
G. A. Lodge
Affiliation:
Agriculture Canada Research Branch, Animal Research Institute, Ottawa, Ontario K1A 0C6, Canada
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Abstract

Eighty-nine crossbred gilts were used in an experiment to assess the effects of age at puberty on growth and their carcass characteristics at market weight. From 100 days of age each gilt was exposed daily to a boar and observed for standing heat. The gilts were slaughtered in a commercial abattoir as they reached market weight (approximately 109 kg live weight). Thirty-two gilts (36%) reached puberty before slaughter. These 32 earlier-maturing gilts grew more slowly than the other 57 (P<0·001) yet, paradoxically, within the group of 32 which had reached puberty, there was a significant negative correlation between age at puberty and average daily gain (r=−0·565; P<0·001). Of the 32, the date at first oestrus was known in 30 cases. Among these 30, 10 had ovulated more than once (early-maturing) and 20 had ovulated once (intermediate maturing). Consistent with the paradox there was a significant negative correlation between age at puberty and rate of gain within each group but the regression line for the early-maturing gilts had a significantly lower intercept, on the gain axis, than that for the intermediate group (P<0·01). There were no significant differences between sexual maturity groups for any of the large number of physical and chemical carcass characteristics studied.

Type
Research Article
Copyright
Copyright © British Society of Animal Science 1981

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References

REFERENCES

Aherne, F. X., Christopherson, R. J., Thompson, J. R. and Hardin, R. T. 1976. Factors affecting the onset of puberty, post-weaning estrus and blood hormone levels of Lacombe gilts. Can. J. Anim. Sci. 56: 681692.CrossRefGoogle Scholar
Beverly, J. R. 1979. Genetic and physiological engineering of meat animals. Proc. Meat Ind. Res. Conf. American Meat Institute Foundation, Virginia.Google Scholar
Brody, S. 1927. Growth and development with special reference to domestic animals. III. Growth rates, their evaluation and significance. Res. Bull. Mo. agric. Exp. Stn, No. 97.Google Scholar
Brooks, P. H. and Cole, D. J. A. 1969. The effect of boar presence on the age at puberty of gilts. Rep. Sch. Agric. Univ. Nott., pp. 7477.Google Scholar
Brooks, P. H. and Cole, D. J. A. 1970. The effect of the presence of a boar on the attainment of puberty in gilts. J. Reprod. Fert. 23: 435440.CrossRefGoogle ScholarPubMed
Christenson, R. K. and Ford, J. J. 1979. Puberty and estrus in confinement-reared gilts. J. Anim. Sci. 49: 743751.CrossRefGoogle ScholarPubMed
Dickerson, J. W. T., Gresham, G. A. and McCance, R. A. 1964. The effect of undernutrition and rehabilitation on the development of the reproductive organs: pigs. J. Endocr. 29: 111118.CrossRefGoogle ScholarPubMed
Fredeen, H. T., Berg, R. T., Bowland, J. P. and Doornenbal, H. 1964. Prediction of yield and value of hog carcasses. Can. J. Anim. Sci. 44: 334346.CrossRefGoogle Scholar
Friend, D. W. 1977. Effect of dietary energy and protein on age and weight at puberty of gilts. J. Anim. Sci. 44: 601607.CrossRefGoogle ScholarPubMed
Frisch, Rose E. 1976. The physiological basis of reproductive efficiency. In Meat Animals: Growth and Productivity (ed. Lister, D., Rhodes, D. N., Fowler, V. R. and Fuller, M. F.), pp. 327354. Plenum Press, New York.CrossRefGoogle Scholar
Hughes, P. E. and Cole, D. J. A. 1975. Reproduction in th e gilt. 1. The influence of age and weight at puberty on ovulation rate and embryo survival in the gilt. Anim. Prod. 21: 183189.Google Scholar
Kirkwood, R. N. and Hughes, P. E. 1979. The influence of age at first boar contact on puberty attainment in the gilt. Anim. Prod. 29: 231238.Google Scholar
Mavrogenis, A. P. and Robison, O. W. 1976. Factors affecting puberty in swine. J. Anim. Sci. 42: 12511255.CrossRefGoogle ScholarPubMed
Ramaley, Judith A. 1979. Development of gonadotropin regulation in the pre-pubertal mammal. Biol. Reprod. 20: 131.CrossRefGoogle Scholar
Reddy, V. B., Lasley, J. F. and Mayer, D. T. 1958. Genetic aspects of reproduction in swine. Res. Bull. Mo. agric. Exp. Stn, No. 666.Google Scholar
Reutzel, L. F. and Sumption, L. J. 1968. Genetic and phenotypic relationships involving age at puberty and growth rate of gilts. J. Anim. Sci. 27: 2730.CrossRefGoogle ScholarPubMed
Robertson, G. L., Grummer, R. H., Casida, L. E. and Chapman, A. B. 1951. Age at puberty and related phenomena in outbred Chester White and Poland China gilts. J. Anim. Sci. 10: 647656.CrossRefGoogle Scholar
Self, H. L., Grummer, R. H. and Casida, L. E. 1955. The effects of various sequences of full and limited feeding on the reproductive phenomena in Chester White and Poland China gilts. J. Anim. Sci. 14: 573–592.CrossRefGoogle Scholar
Steel, R. G. D. and Torrie, J. H. 1960. Principles and Procedures of Statistics with Special Reference to the Biological Sciences. McGraw-Hill, New York.Google Scholar
Warnick, A. C., Wiggins, E. L., Casida, L. E., Grummer, R. H. and Chapman, A. B. 1951. Variation in puberty phenomena in inbred gilts. J. Anim. Sci. 10: 479493.CrossRefGoogle ScholarPubMed
Whittemore, C. T. and Elsley, F. W. H. 1977. Practical Pig Nutrition. 2nd ed.Farming Press, Ipswich.Google Scholar