Short Communication: Correlated Selection Responses in Somatic Cell Count from Selection Against Clinical Mastitis
نویسندگان
چکیده
منابع مشابه
Response to somatic cell count-based selection for mastitis resistance in a divergent selection experiment in sheep.
A divergent selection experiment in sheep was implemented to study the consequences of log-transformed somatic cell score (SCS)-based selection on resistance to natural intramammary infections. Using dams and progeny-tested rams selected for extreme breeding values for SCS, we created 2 groups of ewes with a strong divergence in SCS of approximately 3 genetic standard deviations. A survey of 84...
متن کاملGenetic and economic relationships between somatic cell count and clinical mastitis and their use in selection for mastitis resistance in dairy cattle
Clinical mastitis (CM) and monthly test-day somatic cell count (SCC) records on Holstein cows were used to investigate the genetic and economic relationship of lactation average (of natural logarithms of) monthly test-day SCC (LSCC) with CM. After editing, there were 23663 lactation records on 17937 cows from 257 herds. Three groups of herds were first identified as having low (L), medium (M) a...
متن کاملRelationship of Somatic Cell Count and Mastitis: An Overview
Mastitis is characterized by physical, chemical and bacteriological changes in the milk and pathological changes in the glandular tissue of the udder and affects the quality and quantity of milk. The bacterial contamination of milk from the affected cows render it unfit for human consumption and provides a mechanism of spread of diseases like tuberculosis, sore-throat, Q-fever, brucellosis, lep...
متن کاملBovine Mastitis Pathogens: Prevalence and Effects on Somatic Cell Count
© 2012 Carrillo-Casas and Miranda-Morales, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Bovine Mastitis Pathogens: Prevalence and Effects on Somatic Cel...
متن کاملFeasibility of International Genetic Evaluations of Dairy Sires for Somatic Cell Count and Clinical Mastitis
Selection of foreign sires involves risk when genetic values for breeding goal traits are unknown. Information to support objective selection decisions concerning foreign sires are confined to the information from Interbull=s routine evaluations for production and conformation traits. Functional traits are associated with efficiency of production by their direct influence on costs of production...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2008
ISSN: 0022-0302
DOI: 10.3168/jds.2008-1330