Impact of maternal effects on ranking of animal models for genetic parameter estimation for birth weight in male Afrikaner cattle in Zimbabwe

Bertrand, J.K., Benyshek, L.L., 1987. Variance and covariance estimates for maternally influenced beef growth

traits. J. Anim. Sci. 64, 728.

Brown, C.J., Galvez, M., 1969. Maternal and other effects on birth weight of beef calves. J. Anim. Sci. 28, 162.

Bruckner, C.M., Slanger, W.D., 1986. Symmetric differences squared and analysis of variance procedures for

estimating genetic and environmental variances and covariances for beef cattle weaning weight. II. Estimates

from data set. J. Anim. Sci. 63, 1794-1803.

Burferning, P.J., Kress, D.D., Friedrich, R.L., 1981. Calving ease and growth rate of Simmental-sired calves. III. Direct

and maternal effects. J. Anim. Sci. 53, 1210.

Cantet, R.J.C., 1990. Estimation and prediction problems in mixed linear models for maternal genetic effects. PhD.

Thesis. University of Illinos, Urbana, Illinois.

Cantet, R.J.C., Gionola, D., Misztal, I., Fernando, R.I., 1993. Estimates of dispersion parameters and genetic and

environmental trends for weaning weight in Angus cattle using a maternal animal model with genetic

grouping. Livest. Prod. Sci. 34, 203- 212.

Cantet, R.J.C., Kress, D.D., Anderson, D.C., Doornbos, D.E., Burfening P.J., Blacwell, R.L., 1988. Direct and maternal

variances and covariances and maternal phenotypic effects on preweaning growth of beef cattle. J. Anim. Sci.

, 648.

Cundiff, L.V., 1972. The role of maternal effects in animal breeding. VIII. Comparative aspects of maternal effects. J.

Anim. Sci., 35, 1335- 1337.

Day, K.A., Maclaurin, G., Dube, S., Hlatshwayo, A., Trevor, C., 2003. Capturing the benefits of seasonal climate

forecasts in agricultural management. Final Report for Australian Centre for International Agricultural

Research (ACIAR). June 2003. Sub Project 3- Grazing Systems in Zimbabwe, 67 pp.

Diop, M., 1997. Design and analysis of open nucleus breeding systems for cattle in Senegal. PhD Thesis, University

of Nesbraska, Lincoln, USA

Dodenhoff, J., Van Vleck, L.D., Gregory, K.E., 1999. Estimation of direct, maternal and grandmaternal genetic

effects for weaning weight in several breeds of cattle. J. Anim. Sci. 77, 840- 845.

Gambiza, J., Nyama, C., 2000. Country pasture/forage resource profiles. Country profiles, Zimbabwe. Food and

Agriculture Organization of the United Nations.

Gestmayr, S., 1992. Impact of data structure on reliability of the estimated genetic parameters in an animal model

with maternal effects. J. Anim. Breed. Genet. 109, 321- 336.

Gilmour, A., 1995 Average Information Restricted Maximum Likelihood (AIREML) manual. Ploycopy.

Groeneveld, B.E., Mostetert, E., Rust, T., 1998. The covariance structure of growth traits in Afrikaner beef

population. Liv. Prod. Sci. 55, 99- 107.

Hagreveas, S.K., Bruce, D., Beffa, L.M., 2004. Disaster mitigation options for livestock production in communal

farming systems in Zimbabwe. 1. Background information and literature review. P.O. Box 776, Bulawayo,

Zimbabwe: ICRISAT and FAO Rome, Italy 56pp.

Hlatshwayo, A., 2007. The effects of soil type and woody cover on grass production on rangelands in Zimbabwe.

BSc Thesis Zimbabwe Open University, Bulawayo, Zimbabwe.

Homann, S., Van Rooyen, A.F., Moyo, T., Nengomahsa, Z., 2007. Goat production and marketing: Baseline

information for semi-arid Zimbabwe. P.O. Box 776. Bulawayo, Zimbabwe: International Crops Research

Institute for the Semi-Arid Tropics. 84pp.

Koch, R.M., Cundiff, L.V., Grgory, K.E., Dickerson, G.E., 1973. Genetic and phenotypic relations associated with

preweaning and post weaning growth of Hereford bulls and heifers. J. Anim. Sci. 36, 235- 239.

Lee, C., Pollack, E.J., 1997. Relationship between sire8year interactions and direct-maternal genetic correlation for

weaning weight of Simmental cattle.. J. Anim. Sci. 75, 68- 75.

Meyer, K., 1992a. Variance components due to direct and maternal effects for growth traits of Australian beef

cattle. Liv. Prod. Sci. 31, 179- 204.

Meyer, K., 1992b. Bias and sampling covariances of estimates of variance components due to maternal effects.

Genetique, Selection, Evolution. 24, 487- 509.

Meyer, K., 1997. Estimates of genetic parameters for weaning weight of beef cattle accounting for direct-maternal

environmental covariances. Liv. Prod. Sci. 52, 187- 199.

Meyer K, Garrick MJ, Donnely BJP (1994). Genetic parameters for milk production of Australian beef cows and

weaning weight of their calves. J.Anim. Sci. 72:1155- 1165.

Robinson, D.L., 1996b. Models which might explain negative correlations between direct and maternal genetic

effects. Liv. Prod. Sci. 45, 111- 122.

Robnison, D.L., 1996a. Estimation and interpretation of direct and maternal genetic parameters for weights of

Australian Angus cattle. Liv. Prod. Sci. 45, 1-11.

Willham, R.L., 1972. Role of maternal effects in animal breeding: III. Biometrical aspects of maternal effects in

animals. J. Anim. Sci. 35,1288- 1293.

Willham, R.L., 1980. Problems in estimating maternal effects. Liv. Prod. Sci. 7, 405- 418.