Calves' sex ratio in naturally and artificially bred cattle in central Ethiopia.
作者： Effa Kefena Delesa , Aster Yohannes , Mengistu Alemayehu , Temesgen Samuel , Teshome Yehualaeshet
DOI: 10.1016/J.THERIOGENOLOGY.2014.04.027
关键词:
摘要: A study was undertaken with the objective to identify some intrinsic (genotype of cow, estrus time and parity) extrinsic factors (service type, service seasons) that affect calf sex ratio in naturally artificially bred cattle central highlands Ethiopia. total 4657 calving events were extracted from long-term dairy genetic improvement experiment at Holetta Agricultural Research Center. Factors logit probability a female being born obtained by using PROC GENMODE Statistical Analysis System. Moreover, multivariate analysis performed LOGISTIC procedure forward selection procedure. Accordingly, genotype parity, season, type had considerable influences on ratio. However, did not (χ(2) = 0.83 0.79, respectively). In Ethiopia, smallholder farmers often complain artificial insemination (AI) skewed producing more male calves. our showed AI alter female-to-male On contrary, natural mating increases calves (odds 1.38) over AI. Heifer/cows during harsh seasons years produced than those good year. This strongly agreed Trivers Willard allocation theory.
sci-hub.se 参考文章(12)
Tayfur Bekyürek, Orkun Demiral, Mustafa Ün, Murat Abay, The Effect of Artificial Insemination Timing on the Sex Ratio of Offspring and Fertility in Dairy Cows Turkish Journal of Veterinary & Animal Sciences. ,vol. 31, pp. 21- 24 ,(2007)
R Zobel, D Gereš, I Pipal, V Buić, D Gračner, S Tkalcic, Influence of the semen deposition site on the calves' sex ratio in Simmental dairy cattle. Reproduction in Domestic Animals. ,vol. 46, pp. 595- 601 ,(2011) , 10.1111/J.1439-0531.2010.01708.X
Luc A. Wauters, Simon A. de Crombrugghe, Nadia Nour, Erik Matthysen, Do female roe deer in good condition produce more sons than daughters Behavioral Ecology and Sociobiology. ,vol. 37, pp. 189- 193 ,(1995) , 10.1007/BF00176716
R. L. Trivers, D. E. Willard, Natural selection of parental ability to vary the sex ratio of offspring. Science. ,vol. 179, pp. 90- 92 ,(1973) , 10.1126/SCIENCE.179.4068.90
Alfonso Gutiérrez-Adán, J Granados, JJ Garde, M Perez-Guzman, B Pintado, J De La Fuente, None, Relationship between sex ratio and time of insemination according to both time of ovulation and maturational state of oocyte. Zygote. ,vol. 7, pp. 37- 43 ,(1999) , 10.1017/S0967199499000374
R.H. Foote, Sex ratios in dairy cattle under various conditions Theriogenology. ,vol. 8, pp. 349- 356 ,(1977) , 10.1016/0093-691X(77)90186-8
R. Catalano, T. Bruckner, Secondary sex ratios and male lifespan: Damaged or culled cohorts Proceedings of the National Academy of Sciences of the United States of America. ,vol. 103, pp. 1639- 1643 ,(2006) , 10.1073/PNAS.0510567103
J.R. Roche, J.M. Lee, D.P. Berry, Climatic factors and secondary sex ratio in dairy cows. Journal of Dairy Science. ,vol. 89, pp. 3221- 3227 ,(2006) , 10.3168/JDS.S0022-0302(06)72597-8
Cheryl S. Rosenfeld, R. Michael Roberts, Maternal Diet and Other Factors Affecting Offspring Sex Ratio: A Review Biology of Reproduction. ,vol. 71, pp. 1063- 1070 ,(2004) , 10.1095/BIOLREPROD.104.030890
D.P. Berry, A.R. Cromie, Artificial insemination increases the probability of a male calf in dairy and beef cattle. Theriogenology. ,vol. 67, pp. 346- 352 ,(2007) , 10.1016/J.THERIOGENOLOGY.2006.08.003