منابع مشابه
Fertilization rate and embryonic survival in dairy cows in relation to transferrin and J antigen groupings of sires and dams.
Biochemical polymorphism has been widely discussed in connection with the function of many body systems (for review see Ogden, 1961). One expression of biochemical polymorphism which has been related to reproductive efficiency in cattle is the variation in serum transferrin type. Ashton (1959) considered that embryos differing in /?-globulin (transferrin) type from their dams were less compatib...
متن کاملRanking Dairy Sires by a Linear Programming Dairy Farm Model
Dairy sires were ranked for overall merit by an average daughter's contribution to farm net profit. Biological characteristics of sires and economic factors of a dairy farm were linked by linear programming. Availability and constraints of resources were in the model. Average daughter's returns over variable costs attributable to sire proofs for several traits was the measure of sire's net meri...
متن کاملSpawning frequency of brood dams and sires in a marine fish stock-enhancement hatchery.
Parentage analysis, employing five hypervariable microsatellite markers, was used to follow spawning patterns of red drum Sciaenops ocellatus broodfish in two spawning tanks through most of a calendar year in a marine fish hatchery dedicated to stock enhancement. Five of six dams and all four sires spawned at least once during the year. Variation in dam and sire spawning incidence and in number...
متن کاملSimultaneous genetic evaluation of sires and cows for a large population of dairy cattle.
A strategy for simultaneous sire and cow evaluation of genetic merit was implemented. First lactation records of 1,074,971 Holstein cows in 20,065 herds were included. After inclusion of ancestors, there were 1,741,356 equations: 1,505,938 cow, 229,394 herd-year-season, 6000 sire, and 24 genetic group equations. All known genetic relationships among animals were considered. Genetic group coeffi...
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: 1955
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(55)94955-9