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A genetic approach to parasite resis...

Starnes, Amber Rayfield.

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A genetic approach to parasite resistance in beef cattle.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A genetic approach to parasite resistance in beef cattle./
作者:	Starnes, Amber Rayfield.
面頁冊數:	34 p.
附註:	Source: Masters Abstracts International, Volume: 49-01, page: 0231.
Contained By:	Masters Abstracts International49-01.
標題:	Agriculture, Animal Culture and Nutrition. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1485900
ISBN:	9781124196695

A genetic approach to parasite resistance in beef cattle.
Starnes, Amber Rayfield.

A genetic approach to parasite resistance in beef cattle. - 34 p.

Source: Masters Abstracts International, Volume: 49-01, page: 0231.

Thesis (M.S.)--University of Arkansas, 2010.

Resistance can be regarded as the genetically transmitted ability of an animal to combat the establishment of an infection. Parasite resistance to chemical control is an increasing concern for cattle producers around the world. The need to develop non-chemical control must be reached with compromise between productive traits and resistance to parasites. Internal parasites are prevalent in the Southern region of the United States due to the climatic conditions which produces year-round forage making it difficult to have sufficient time between grazing bouts to break the life cycle of nematodes common in the area. The annual economic loss is estimated to be greater than

ISBN: 9781124196695Subjects--Topical Terms:

1017857
Agriculture, Animal Culture and Nutrition.

A genetic approach to parasite resistance in beef cattle.
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520 $a Resistance can be regarded as the genetically transmitted ability of an animal to combat the establishment of an infection. Parasite resistance to chemical control is an increasing concern for cattle producers around the world. The need to develop non-chemical control must be reached with compromise between productive traits and resistance to parasites. Internal parasites are prevalent in the Southern region of the United States due to the climatic conditions which produces year-round forage making it difficult to have sufficient time between grazing bouts to break the life cycle of nematodes common in the area. The annual economic loss is estimated to be greater than $2 billion due to the cost of treatment and the decrease in productivity. The most sustainable and cost effective method would be to genetically select for parasite resistance in cattle management. Our study consisted of purebred Angus calves which were maintained on primarily endophyte-infected fescue. Reports have shown a positive correlation between prolactin concentrations and fecal egg counts. Our study focused on prolactin genotypes as predictors which would have the lowest fecal egg count (FEC) and possibly parasite resistance. We also estimated FEC heritabilities of calves as an indicator that resistance could be passed to future generations. The heterozygous prolactin genotype (CT) had the lowest FEC among the three prolactin genotypes at weaning for nematodirus. Our estimates of heritability showed moderate heritability for strongyle FECs for calves at yearling and a high estimate of heritability at post-breeding. Our estimates showed low heritability for strongyle FECs for calves at weaning and pre-breeding. If genetic control of FEC is polygenic and moderately heritable, then selection could result in genetic change in subsequent generations. Using genetic selection for parasite resistance would reduce the need to use chemical control. With marker assisted selection, herd management could be designed to be independent from the usage of anthelmintics which would reduce public anxiety and production costs.
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