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Showing 1 to 20 of 93 for “"Sires"”.
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Great sires of the Guernsey breed
The popular sires are not always the greatest sires, for in many cases popular sites are not capable of transmitting average high production to their daughters. The true measure of a sire’s merit is the high average production of all his daughters, rather than the total number of Advanced Register …
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Differential removal of daughters among A1 sires
Thesis (M.S.)--Michigan State University. Dept. of Dairy, 1966
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Leading Hereford Sires in the United States
The forty-eight animals that won first, second, third, and fourth places in the twelve regular classes at the 1913 International Live Stock Show are taken as basis for this study. Each and every one of these animals are representative of the highest of Hereford standards. While it is true that …
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Interactions of Sires With Feeding and Management Factors in Illinois Holstein Cows
… in milk yield due to the interactions between sires and several feeding and management factors and to examine the implications of the estimated interactions in sire evaluation for milk yield. Data on feeding and management practices in Illinois Holstein herds on official DHI and DHIR testing …
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Characteristics of progeny test herds and their effects on the genetic evaluation of young sires
… their effects on the genetic evaluation of young sires. Data for a study of response to pedigree selection by stud were evaluated from 6238 Holstein sires in four USDA animal model evaluations from January 1995 to February 1997. When data were restricted to the nine major semen producing …
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A study of growth rate and type score of offspring of four different sires in Hereford cattle
A study of growth rate and body type of calves of both sexes; estimates of heritability of growth rate and body type; and the effect of data of birth on growth rate was made on 76 calves in the same herd sired by four unrelated bulls. The calves were scored for body types at birth, weaning and the …
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A Study of Effects of Blood Types, Sires, Litter Size and Other Factors on Sex Ratios in Pigs
Sex distributions were studied in association with 11 pig blood group systems, (A, B, C, D, E, F,G, H, J, K and L) in matings segregating for blood types and analyzed by using segregation ratios as well as by the least-squares method. Effects of sire, litter size and selection for high whole-body …
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Improving pedigree prediction, sire, and cow evaluation by adjusting production data for past reproductive performance
… open. Model I included the mean, HYS, groups, sires of herdmates (fixed) and young bulls within groups (random). In model II, the same effects were used considering all bulls and sires random with adding the relationship among bulls. Data were 24,997 progenies of 484 young bulls and 119,013 …
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Residual feed intake, breed of sire and dam, and individual sire affect performance and carcass characteristics and rates of back fat and intramuscular fat of feedlot steers
… characteristics analyzed. Steers from Angus sires had 23% (0.33 cm, P < 0.0001) higher carcass back fat (BF) than steers from Simmental sires. Steers from Angus sires had higher (P = 0.0002) marbling score (MS) than steers from Simmental sires. Meat tenderness was similar (P = 0.98) between …
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Evaluating long term benefits of genomic selection programs in beef cattle breeding programs in Western Canada
… Canada. A total of 24 breeding groups and 117 sires (some repeated) were followed over 6 breeding and calving years to determine the association between sire performance over multiple years, number of calves sired, calf performance, and replacement heifer performance over multiple years. To …
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Comparison of expected and actual progeny growth differences in crossbred calves
… commercial beef production. Polled Hereford sires were selected from the high accuracy sires listed in the American Polled Hereford Association's sire summary. Four types of sires were used: 1) Sires with high yearling weight and high maternal EPD's; 2) Sires with high yearling weight and low …
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Great individuals of the Guernsey breed
… and Itchen Daisy 3d. 15630. 4. The two greatest sires or the Guernsey breed, based on the production of their daughters, are Ne Plus Ultra 15265 and King of the May 9001. 5. The two greatest sires of the Guernsey breed, based on the showyard winnings of their offspring, are Hayes Cherub 2d 25147 …
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The Influence of Artificial Insemination in Three Midwestern States
… the accuracy and effectiveness of selection of sires is of utmost importance. Selection of sires plays a major role in the genetic improvement of dairy cattle since a sire can leave many more descendants than a female. Consequently, the use of outstanding males is important in the genetic …
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A comparison of herdmate, iterative, and mixed model sire summaries for type in Holstein cattle
… adjusting for average PDT of herdmates' sires and average cow index of herdmates respectively, and a mixed model method. PDTs were calculated using the different methods for 6816 bulls with ten or more daughters. Mean PDT for the herdmate comparison was -.18 while means for the two …
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Correlation of predicted breeding values across environments in the presence of selection for direct and maternal breeding values
… direct and maternal breeding values (BV) of sires were simulated for sires evaluated independently in two different environments. Prediction error variances and covariances among direct and maternal BV within environments were required for the simulation. To obtain the necessary input …
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Improvement in accuracy using records lacking sire information in the animal model
… group effects and breeding values of cows and sires were used as measures of estimation accuracy. Alternative methods were examined to determine 1) optimum, minimum management group size, 2) increases in estimation accuracy of alternative methods relative to the conventional method of …
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Index selection in terminal sire sheep: implications for genetic improvement in a crossbreeding system
Using terminal sires for crossbreeding is standard practice in the UK sheep industry, where over 70% of market lambs have terminal sire breeding. Thus, selection focusing on terminal sires will translate to changes in the entire industry. Consumers perceive lamb meat as fatty and demand for it has …
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Fine Mapping and Evolution of a QTL Region on Cattle Chromosome 3
… to be identical by descent was identified in sires, S1 and S2. This shared haplotype block was found to be associated with high milk yield in families, F1 and F2, confirming previous studies. Maternal haplotypes of offspring were then used to define linkage disequilibrium (LD) within the QTL …
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Factors affecting the accuracy and stability of sire proofs from progeny test herds
… kg) yield. Genetic trend computed from PTAs of sires of first crop cows increased 58 kg milk and 1.5 kg fat per year from 1971 to 1978 and 176 kg milk. and 5.5 kg fat per year from 1979-87. The genetic level of daughters of young sires born after 1983 was equivalent or exceeded the genetic level …
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