A comparative Study of Regularized Regression Approaches using R: Application to SNP and Litter Size of Yorkshire Pigs

2014 ◽  
Vol 48 (3) ◽  
pp. 147-155
Author(s):  
Minsu Park ◽  
◽  
Tae-Hun Kim ◽  
Eun-Seok Cho ◽  
Heebal Kim ◽  
...  
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Regularized Regression ◽  
Yorkshire Pigs

Performance of lambs from three crossbred ewe types

1984 ◽  
Vol 39 (1) ◽  
pp. 81-87 ◽  
Author(s):  
N. D. Cameron ◽  
C. Smith ◽  
F. K. Deeble
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Survival Rates ◽  
England And Wales ◽  
Second Stage

ABSTRACTThe performance of predominantly Suffolk-sired lambs from Border Leicester (BL), Bluefaced Leicester (BFL) and ABRO Damline (DL) crossbred ewes was compared on 18 commercial and college farms throughout England and Wales. The comparison took place over the 5-year period 1977 to 1981 and was the second stage in a comparative study on the productivity of the crossbred ewes. A total of 1277 crossbred ewes were involved with data on up to 3 years lambings per ewe, giving a total of 3522 mating records and 4864 lamb records.The BFL lambs were heaviest and the DL lambs were lightest. The DL lambs had the lowest survival rates, and the BFL lambs the highest. The BFL lambs were slaughtered earlier (12 days) and at heavier weights (1·4 kg) than the DL and BL lambs, and had slightly heavier carcasses. The DL and BFL carcasses had better MLC carcass classifications than the BL, resulting in an advantage of 4 p/kg of carcass.In productivity per ewe, the BFL litters had the highest slaughter and carcass weights and the highest income per litter, with the DL litters intermediate. An attempt was made to express productivity per unit of sheep weight maintained, taking account of ewe weight, litter size and the lamb slaughter date. On this index, the DL were marginally superior to the BFL, and both were superior to the BL.

A comparative study of fat and protein levels in the colostrum of prolific and non-prolific sheep

1998 ◽  
Vol 1998 ◽  
pp. 104-104
Author(s):  
J.M.L. Anderson ◽  
M.N.I. Barclay ◽  
M. J. Harvey ◽  
A. Waterhouse
Keyword(s):  
Body Weight ◽  
Comparative Study ◽  
Litter Size ◽  
Protein Levels

It is vital that lambs receive at least 50ml/kg body weight of colostrum as soon as possible after birth. Without this, the lamb will be deprived quickly of energy for thermoregulation, as well as antibody protection. Colostrum contains high levels of fats and lactose, proteins and vitamins; however the consistency and colour vary between individual animals. Little is known of the cause of these variations. This experiment aimed to examine whether there were breed, age, genotype and litter size differences in the fat and protein levels of ewe colostrum collected within one hour of parturition.

scholarly journals A comparative study of litter size and sex composition in a large dataset of callitrichine monkeys

2019 ◽  
Vol 81 (9) ◽  
Author(s):  
Dakota E. McCoy ◽  
Brett M. Frye ◽  
Jennifer Kotler ◽  
Judith M. Burkart ◽  
Monika Burns ◽  
...  
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Sex Composition ◽  
Large Dataset ◽  
Size And Sex Composition

Estimation of genetic parameters for litter size in Danish Landrace and Yorkshire pigs

1995 ◽  
Vol 60 (2) ◽  
pp. 315-324 ◽  
Author(s):  
J. Estany ◽  
D. Sorensen
Keyword(s):  
Litter Size ◽  
Mean Squared Error ◽  
Predictive Ability ◽  
The Other ◽  
Genetic Trend ◽  
Genetic Groups ◽  
Squared Error ◽  
Random Models ◽  
Yorkshire Pigs ◽  
Predicted Values

AbstractVariance components for litter size (total number of piglets born) were estimated from Danish purebred Landrace and Yorkshire litters by restricting maximum likelihood. The data were collected from the national Danish breeding programme and consisted of 19 666 litters in Danish Landrace and 29 336 litters in Danish Yorkshire. Four different analyses for litter size were conducted within breed. In the first two, genetic groups were included in the model in order to account for the importation of animals from other countries; in the other two, genetic groups were removed from the model. Within each case, herd-year-type of insemination effects were fitted as fixed (H-fixed models), or herd-year-season-type of insemination effects were fitted as random (H-random models). Estimates of heritability ranged from about 0·11 to 0·14 in Landrace and from 0·10 to 0·11 in Yorkshire. Variance due to herd-year-season-type of insemination ranged from 0·029 to 0·041 of total variance, values somewhat lower than those obtained for non-genetic permanent effects. In order to compare the four models, data were divided into different subsets, and records from one subset were predicted using parameters estimated from the other subset. Both the correlation between observed and predicted values, and the mean squared error of prediction indicated that predictive ability was higher in the case of H-random models. There was no evidence that genetic groups improved the predictive ability for litter size. However, group effects affected inferences about genetic trend, particularly in Landrace, where genetic group composition changed consistently over the years.

scholarly journals Erratum

1995 ◽  
Vol 61 (1) ◽  
pp. 176-176
Keyword(s):  
Litter Size ◽  
Genetic Parameters ◽  
Yorkshire Pigs ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for litter size in Danish Landrace and Yorkshire pigs

scholarly journals Bayesian Analysis of Response to Selection: A Case Study Using Litter Size in Danish Yorkshire Pigs

Genetics ◽  
2000 ◽  
Vol 156 (1) ◽  
pp. 283-295
Author(s):  
D Sorensen ◽  
A Vernersen ◽  
S Andersen
Keyword(s):  
Bayesian Analysis ◽  
Litter Size ◽  
Genetic Model ◽  
Correlated Response ◽  
Model Assessment ◽  
Response To Selection ◽  
Probability Interval ◽  
Posterior Mean ◽  
Assessment Study ◽  
Yorkshire Pigs

Abstract Implementation of a Bayesian analysis of a selection experiment is illustrated using litter size [total number of piglets born (TNB)] in Danish Yorkshire pigs. Other traits studied include average litter weight at birth (WTAB) and proportion of piglets born dead (PRBD). Response to selection for TNB was analyzed with a number of models, which differed in their level of hierarchy, in their prior distributions, and in the parametric form of the likelihoods. A model assessment study favored a particular form of an additive genetic model. With this model, the Monte Carlo estimate of the 95% probability interval of response to selection was (0.23; 0.60), with a posterior mean of 0.43 piglets. WTAB showed a correlated response of −7.2 g, with a 95% probability interval equal to (−33.1; 18.9). The posterior mean of the genetic correlation between TNB and WTAB was −0.23 with a 95% probability interval equal to (−0.46; −0.01). PRBD was studied informally; it increases with larger litters, when litter size is >7 piglets born. A number of methodological issues related to the Bayesian model assessment study are discussed, as well as the genetic consequences of inferring response to selection using additive genetic models.

A comparative study of fat and protein levels in the colostrum of prolific and non-prolific sheep

1998 ◽  
Vol 1998 ◽  
pp. 104-104 ◽  
Author(s):  
J.M.L. Anderson ◽  
M.N.I. Barclay ◽  
M. J. Harvey ◽  
A. Waterhouse
Keyword(s):  
Body Weight ◽  
Comparative Study ◽  
Litter Size ◽  
Protein Levels

It is vital that lambs receive at least 50ml/kg body weight of colostrum as soon as possible after birth. Without this, the lamb will be deprived quickly of energy for thermoregulation, as well as antibody protection. Colostrum contains high levels of fats and lactose, proteins and vitamins; however the consistency and colour vary between individual animals. Little is known of the cause of these variations. This experiment aimed to examine whether there were breed, age, genotype and litter size differences in the fat and protein levels of ewe colostrum collected within one hour of parturition.

REPRODUCTIVE PERFORMANCE OF GILTS FROM LINES SELECTED FOR FEED UTILIZATION AND CARCASS SCORE

1972 ◽  
Vol 52 (2) ◽  
pp. 267-271
Author(s):  
M. H. FAHMY ◽  
C. S. BERNARD
Keyword(s):  
Least Squares ◽  
Litter Size ◽  
Reproductive Performance ◽  
Reproductive Traits ◽  
Feed Utilization ◽  
Gestation Length ◽  
Litter Weight ◽  
Yorkshire Pigs ◽  
Score Line ◽  
Size At Birth

Eight reproductive traits were studied on 751 gilts of 3 lines of Yorkshire pigs derived from a common population by selecting for feed utilization (line 1), carcass score (line 2), and for both traits combined (line 3) during 10 generations. Least squares means for the traits were as follows: gestation length 115.2 days; litter size at birth 9.0 pigs (total) and 8.4 pigs (alive); litter size at weaning 6.8 pigs; number of teats 13.4; and litter weight at birth, 21, and 56 days, 9.3, 32.6, and 92.6 kg, respectively. Heritability estimates were calculated for each line by half-sib correlation and intra-sire regression of offspring on dam. The pooled estimate for the above eight traits was 0.45, 0.11, 0.09, 0.15, −0.12, 0.08, 0.14, and 0.14, respectively. Line effect was highly significant for all traits except litter size at birth. Means and heritabilities for line 3 were higher than those for lines 1 and 2, which did not differ greatly from each other. Variation from year to year had significant effects only on litter weight at different ages. The within years–within line regressions of the eight traits on inbreeding were not significant. The within line phenotypic correlations between each of feed utilization and carcass score and the eight traits were generally low and nonsignificant.

scholarly journals Differential expression of miR-145, miR-429 and its target genes in partial reproductive tissues of swine with high and low litter size

2017 ◽  
Vol 17 (3) ◽  
pp. 671-681 ◽  
Author(s):  
Xiao-Dong Zhang ◽  
Yi-Fang Feng ◽  
Xu Zhang ◽  
Mi Tian ◽  
Tao Wu ◽  
...  
Keyword(s):  
Litter Size ◽  
Target Genes ◽  
Opposite Pattern ◽  
Tissue Samples ◽  
Reproductive Regulation ◽  
Real Time Quantitative Pcr ◽  
Reproductive Tissues ◽  
E Box ◽  
Yorkshire Pigs ◽  
Zeb1 Expression

Abstract To justify the function of miRNAs in reproductive regulation in swine, the expression of miR-145, miR-429 and their related genes were studied in reproductive tissues of sows. Wannan black pig and Yorkshire pigs with extremely high (n=6) and low (n=6) litter size were sampled, and real-time quantitative PCR (qPCR) was performed on tissue samples from ovaries, uterus, oviduct, hypothalamus, and pituitary. The results indicated that miR-145, miR-429, and zinc finger E-box binding homeobox 1 gene (ZEB1) were expressed significantly different in Wannan black pig and Yorkshire pigs. In pigs with different fecundity, miR-145 in the uterus was expressed significantly lower in pigs with high litter size, than in pigs with low litter size. The miR-429 expression in the oviduct and pituitary of pigs with high litter size was significantly higher compared with tissues sampled from pigs with low litter size. The ZEB1 expression in the pituitary was lower in pigs with high litter size in comparison to pigs with low litter size, while luteinizing hormone beta subunit (LHβ) showed the opposite pattern of expression. In conclusion, miR-145 and miR-429 were differently expressed in pigs with high and low litter size and might have a role in affecting litter size of sows.

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