搜索结果: 1-12 共查到“家畜繁殖学 selection”相关记录12条 . 查询时间(0.257 秒)
Claw health and feed efficiency as new selection criteria in the Czech Holstein cattle Krupová Z., Wolfová M., Krupa E., Přibyl J., Zavadilová L.
dairy cattle breeding objective selection index economic weights prognosis
2018/11/23
The objective of this study was to calculate economic weights for ten current breeding objective traits and for four new traits characterising claw health and feed efficiency in Czech Holstein cattle ...
Response to selection of a breeding program for Suffolk sheep in the Czech Republic
lamb breeding values growth performance traits performance recording
2018/11/23
Lamb growth performance traits in relation to parental breeding values (BVs) for these traits were evaluated in a purebred Suffolk sheep population in the Czech Republic. The research lasted over 8 ye...
Genetic correlations between first parity and accumulated second to last parity reproduction traits as selection aids to improve sow lifetime productivity
Breeding Swine Genetic Parameters Reproduction Traits Subsequent Reproductive Performance
2017/3/9
The objective of this research was to estimate genetic correlations between number of piglets born alive in the first parity (NBA1), litter birth weight in the first parity (LTBW1), number of piglets ...
Validation of selection accuracy for the total number of piglets born in Landrace pigs using genomic selection
Genomic Selection Total Number of Piglets Born Landrace
2017/3/8
This study was to determine the relationship between estimated breeding value and phenotype information after farrowing when juvenile selection was made in candidate pigs without phenotype information...
Offspring sex ratio in domestic goats: Trivers-Willard out of natural selection
maternal age parental investment sex allocation
2015/7/7
In the present
study we have analyzed an extensive data set on the secondary sex ratio (SSR) including 59 335 goat kids born
in 30 633 litters to 11 644 mothers on farms all over the Czech Republi...
Use of endometrial cytology and metabolic profiles for selection of embryo donor cows
serum chemistry parameters endometritis neutrophils
2014/10/28
The aim of this study was to evaluate the use of endometrial cytology and metabolic profiles for selection of donor cows in embryo transfer programmes. For this purpose, 69 clinically healthy Holstein...
Persistency of Laying Strain Building by Index Selection Including Oviposition Time as Selection Trait in Laying Hen
laying hen strain building selection oviposition time persistency of laying
2009/7/31
In this study a selection experiment was carried out in order to investigate the effectiveness of index selection including oviposition time as a selection trait for persistency of laying strain build...
A Review of Some Results of Selection for Juvenile Body Weight in Chickens
broilers correlated responses feed intake growth selection
2009/7/31
The development of the commercial broiler industry during the last half of the 20th century has seen dramatic changes in growth, feed efficiency, and yield. In this paper we extracted results from thr...
Comparison of Selection and Mating Systems for Maintenance of Closed Poultry Lines Using Several Breeding Cages
closed line effective population size inbreeding coefficient mating selection
2009/7/30
In a typical maintenance plan of closed poultry lines, breeding individuals are divided into several groups each with one male and several females. The groups are put into different breeding cages and...
Maximizing the Selection Response by Optimal Quantitative Trait Loci Selection and Control of Inbreeding in a Population with Different Lifetimes between Sires and Dams
Selection Optimization Quantitative Trait Loci Inbreeding Restriction
2016/4/28
A rule was developed to constrain the annual rate of inbreeding to a predefined value in a population with different lifetimes between sires and dams, and to maximize the selection response over gener...
Changes in Reproductive Traits of Large White Pigs after Estrogen Receptor Gene-based Selection in Slovakia: Preliminary Results
ESR Gene Litter Size Pigs Selection
2016/4/27
We investigated the effect of ESR gene-based selection on an improvement of litter size in the herds in real (non-experimental) conditions. The pigs were selected for three years. In the tested popula...
Efficiency of Different Selection Indices for Desired Gain in Reproduction and Production Traits in Hariana Cattle
Selection Indices Desired Gain Heritability Phenotypic and Genetic Correlation Production and Reproduction Traits Hariana Cattle
2016/4/13
An investigation was conducted on 729 Hariana cows maintained at Government Livestock Farm, Hisar, from 1973 to 1999, with an objective to compare the efficiency of various selection indices for attai...