Reproductive in efficiency is a widespread problem in a ll domestic animal species. Its causes are many. Aside from accidental causes these include anatomical defects o f the reproductive system, disturbed endocrine function, nutritional imbalance or insufficiency, v ira l or bacterial infections, inherited lethal genes and chromosomal defects. The rela tive importance o f these factors as causes o f reproductive in efficien cy is not yet known

H. A Swartz, D. W Vogt

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 478–482, 1982
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