[email protected]. 58%ANIMAL PRODUCTION SYSTEM BEEF ASSIGNMENT: RD23420This assignment is my own work, presented in my own words, ALL sources of information have been cited and all direct quotes are contained in quotation marks. Production from a fall calving herd of Limousin x Friesian cows that were mated to Charolais Bulls.TRAIT BIRTH WEIGHT JUNE Average-D-GainSire 1 Female 38,239.2 0.85 Sire 2 Female 48,204.1 1.54 Father 3 Female 39,286.1 1.12TRAIT BIRTH WEIGHT JUNE WEIGHT Average-D-Gain Father 1 Male 39,255.8 0.98 Father 2 Male 4 3,219.7 0.77Father 3 Male 38,362.2 1.29The change climatic and meteorological. Heredity and breed genetics can be contained in genes, which can lead to infertility, but some are genetically infertile. The birth weight was better as well as that of June, but the average daily gain was not good due to the harsh conditions they faced during the winter, due to dry matter feeding, wind, cold and lack of natural minerals as well as stress and cold water. Age, climate, metritis and poor management can also lead to infertility. Genetic mutations can be part of infertility if they occur, as well as embryonic abnormalities. All these deadly factors can cause sterility in Holstein-Friesian cows. Body weight determines puberty and poor nutrition causes irregular cycles in cows and reduces ovulation, pregnancy toxemia and weak offspring. The physical size of the cow can affect the mating and carrying ability of the fetus during the birth of offspring. Cows are polyestrous animals, their calves are born at this time, giving them the best chance of survival. High summer temperatures are a major cause of poor quality sperm formation in bulls and reduce sexual activity, as well as... middle of paper ......tosis and lactic acidosis are caused by poor management of cow nutrition.=1500ReferencesABS Global. (2012). Directory of dairy bulls. ABS. Allen, D. and Kilkenny, B. (1990). Planned production and marketing of beef. Granada Editions. Blowey, R. W. (1990). A veterinary book for dairy farmers (third ed.). Old Pont Publishing Ltd. British Charolais Cattle Society. (2012). Charolais. Retrieved December 10, 2013 from the British Charolais Cattle Society: http://www.charolais.co.uk/Craplet, C. (1963). The dairy cow. Eldora: Edward Arnold Publishing. DISKIN, M.G. (1999). British Society of Animal Science. Volume 2 (number 26).Diskin, MG (201). Fertility in the high-producing dairy cow (Vol. Volume 2). BSAS.M Dufrasne, IM (2013). Journal of Animal Sciences. Animal Genetics, Volume 91 (12). S, LA and John, F. (2011). Improved Grassland Management (New ed.). Crowood Press.