Age and Weight at Puberty in American Brahman Heifers
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Published:
Oct 27, 2020
Keywords:
American Brahman Age at puberty Weight at puberty
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Abstract
The average age at puberty (Age-P) of American Brahman heifers was 707.07 days and the average weight at puberty (Wt.-P) was 341.32 kg. The birth weight, weaning weight at 205 days (WW.), preweaning ADG and postweaning ADG were 24.83 kg., 162.45 kg., 668.34 gm/day and 280.21 gm/day respectively. The influence of sire on Age-P was significantly different (P<0.05), but age of dam and calving seasons did not significantly affect (P>0.05) the two traits studied. The correlation between Age-P and Wt.-P was 0.75 (P<0.01). The correlations between postweaning ADG on Age-P and Wt.-P were -0.27 (P<.05) and -0.83 (p<0.01) respectively. The Regression of postweaning DG effect on Age-P was -1.30 (P<0.01)
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References
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Short, R.E. and Bellows R.A., (1971). Relationships Among Weight Gains, Age at Puberty and Reproductive Performance in Heifers. J.Anim. Sci. 32: 127.
Cundiff, L.V., Gregory K.E., Koch R.M., and Dickerson G.E., (1986). Genetic diversity among cattle breeds and use to increase beef production efficiency in a temperature environment. Proc. 3 rd World Congr. on Genet. Appl. to Livest. Prod., IX. pp 271-282. Lincoln, NE.
Dale, H.E., Ragsdale A.C., and Cheng S.S., (1959). Effect of constant environmental temperatures, 50 degrees and 80 degrees F., on appearance of puberty in beef calves. J.Anim.Sci. 18: 1363.
Harvey, W.R. (1975). Least square analysis of data with unequal sub-class numbers. Publication ARS H-4. USDA Agriculture Research Service. 157 p.
Martin, L.C., Brinks J.S., Bourdan R.M., and Cundiff L.V., (1992). Genetic Effects on Beef Heifer Puberty and Subsequent Reproduction. J.Anim. Sci. 70: 4006.
Nelson, T.C., Long C.R., and Cartwright T.C., (1982). Postinflection Growth in Straightbred and Crossbred Cattle. II. Relationships among Weight, Height and Pubertal Characters. J.Anim.Sci. 55: 293.
Nelson, T.C., Short R.E., Phelps D.A. and Staigmiller R.B., (1985). Nonpuberal Estrus and Mature Cow Influences on Growth and Puberty in Heifers. J.Anim.Sci. 61: 470.
Patterson, D.J., Corah L.R., Brethour J.R., Higgins J.J., Kiracofe G.H., and Sterenson J.S., (1992a). Evaluation of Reproductive Traits in Bos taurus and Bos indicus Crossbred Heifers: Relationship of
Age at Puberty to Length of the Postpartum Interval to Estrus. J.Anim. Sci. 70: 1994.
Patterson, D.J., Perry R.C., Kirocofe G.H., Bellows R.A., StraigmillerR.B. and Corah L.R., (1992b). Management Considevations in Heifer Development and Puberty. J.Anim. Sci. 70: 4018.
Plasse, D., Warnick A.C., and Koger M., (1968). Reproductive Behavior of Bos indicus Females in a Subtropical Environment. I. Puberty and Ovulation Frequency in Brahman and Brahman x British Heifers. J.Anim.Sci. 27:94.
Roberson, M.S., Wolfe M.W., Stumpf T.T., Werth I.A., Cupp A.S., Kojima N., Wolfe P.L., Kittok R.J.,and Kinder J.E., (1991). Influence of Growth Rate and Exposure to Bulls on Age at Puberty DE in Beef Heifers. J.Anim.Sci. 69: 2092.
SAS. (1990). SAS. User's Guide: Statistics. SAS. Inst., Inc., Cary, Nc. USA.
Short, R.E. and Bellows R.A., (1971). Relationships Among Weight Gains, Age at Puberty and Reproductive Performance in Heifers. J.Anim. Sci. 32: 127.
