scholarly journals Estimation of co-variance components, genetic parameters and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia

2020 ◽  
Author(s):  
Ebadu Areb ◽  
Tesfaye Getachew ◽  
MA Kirmani ◽  
Tegbaru G/silase ◽  
Aynalem Haile
Keyword(s):  
Variance Components ◽  
Genetic Parameters ◽  
Reproductive Traits ◽  
Breeding Program ◽  
Community Based ◽  
Genetic Trends

scholarly journals Estimation of variance components, genetic parameters and genetic trends for litter size of swines

2010 ◽  
Vol 39 (10) ◽  
pp. 2155-2159 ◽  
Author(s):  
Leandro Barbosa ◽  
Paulo Sávio Lopes ◽  
Adair José Regazzi ◽  
Robledo de Almeida Torres ◽  
Mário Luiz Santana Júnior ◽  
...  
Keyword(s):  
Litter Size ◽  
Variance Components ◽  
Genetic Parameters ◽  
Random Effect ◽  
Additive Model ◽  
Fixed Effect ◽  
Likelihood Method ◽  
Phenotypic Variance ◽  
Estimation Of Variance ◽  
Genetic Trends

Records of Large White breed animals were used to estimate variance components, genetic parameters and trends for the character total number of born piglets (TNBP) as measure of litter size. For obtaining variance components and genetic parameters, it was used the Restricted Maximum Likelihood Method using MTDFREML software. Two mixed models (additive and repeatability) were evaluated. The additive model contained fixed effect of the contemporary group and the following random effects: direct additive genetic and residual effect for the first parturition. Repeatability model had the same effects of the additive model plus parturition order fixed effect and non-correlated animal permanent environment random effect for the second, third and forth parturition. Direct additive heritability estimates for TNBP were 0.15 and 0.20 for the additive and repeatability models, respectively. The estimate of the ration among variance of the non-correlated effect of animal permanent environment effect and the phenotypic variance, expressed as total variance proportion (c2) was 0.09. The estimates of yearly genetic trends obtained in the additive and repeatability models have similar behaviors (0.02 piglets/sow/year).

scholarly journals Genetic effects on reproductive traits in Warmblood horses

2009 ◽  
Vol 89 (2) ◽  
pp. 215-218 ◽  
Author(s):  
A. Wolc ◽  
G. Torzynski ◽  
T. Szwaczkowski
Keyword(s):  
Key Words ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Genetic Effect ◽  
Reproductive Traits ◽  
Additive Genetic Effect ◽  
Reproductive Efficiency ◽  
Horse Breeding ◽  
Estimate Heritability ◽  
Genetic Trends

Reproductive efficiency is an important issue in horse breeding. However, almost no estimates of genetic parameters of reproductive traits in horses can be found in the literature. The objective of the study was to estimate heritability and genetic trends of foaling rate and number of reproductive seasons in Warmblood horses. The records of 3965 mares from six studs were analyzed. Mares were on average kept for 7.3 reproductive seasons with a foaling rate of 66%. Models included fixed effects of stud, period of birth, breed and random additive genetic effect. Heritability estimates were 0.12 for foaling rate and 0.17 for number of reproductive seasons. Key words: Heritability, reproduction, horse

scholarly journals Estimates of genetic parameters and genetic trends for reproductive traits and weaning weight in Tabapuã cattle1,2

2015 ◽  
Vol 93 (11) ◽  
pp. 5175-5185 ◽  
Author(s):  
P. A. Bernardes ◽  
D. A. Grossi ◽  
R. P. Savegnago ◽  
M. E. Buzanskas ◽  
I. Urbinati ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Reproductive Traits ◽  
Weaning Weight ◽  
Genetic Trends

scholarly journals Genetic Parameters, Breeding Values and Genetic Trends for Some Productive and Reproductive Traits of Holstein Cows in Egypt

2019 ◽  
Vol 45 (1) ◽  
pp. 142-154
Author(s):  
Tamer M. Abdel-Hamid ◽  
Khairy M. El-Bayoumi ◽  
Mahmoud S. El-Tarabany ◽  
Wafaa R.I.A. Sherief
Keyword(s):  
Genetic Parameters ◽  
Reproductive Traits ◽  
Holstein Cows ◽  
Breeding Values ◽  
Genetic Trends

scholarly journals Genetic parameters and trends for reproductive traits in Blanco Orejinegro cattle from Colombia

2021 ◽  
Vol 42 (4) ◽  
pp. 2523-2538
Author(s):  
Sindy Liliana Caivio-Nasner ◽  
◽  
Albeiro López-Herrera ◽  
Luis Gabriel González-Herrera ◽  
Juan Carlos Rincón Flórez ◽  
...  
Keyword(s):  
Inbreeding Depression ◽  
Genetic Parameters ◽  
Environmental Influence ◽  
Cattle Breed ◽  
Heritability Estimate ◽  
Reproductive Traits ◽  
Genetic Trend ◽  
Genetic Progress ◽  
Estimated Breeding Values ◽  
Genetic Trends

The Colombian creole cattle breed Blanco Orejinegro (BON) is an important zoogenetic resource, but there is little knowledge about the genetic parameters and trends of its reproductive traits. Therefore, the aim of this study was to estimate parameters for the reproductive traits calving interval (CI), age at first calving (AFC), gestation duration (GD) and genetic trends for CI in the BON breed. Genealogy information from 7,799 animals was used, and employing the MTDFREML program, the components of the variance, heritability (h2), repeatability (rep), and estimated breeding values (EBV) for CI (n=3308), AFC (n=729), and GD (n=306) were estimated, in addition to the inbreeding coefficient (F) of the population. Genetic trends were established through linear regression using R software. Finally, the animals were classified as inbred (F > 0) and noninbred (F=0), and the effect of inbreeding on reproductive performance was established through a generalized linear model using the R program. An average F value of 4.41%±0.06 was observed. The h2 for CI was 0.11±0.03 with a rep of 0.15±0.04; for AFC, h2 was 0.00±0.05; and for GD, h2 was 0.00±0.08. The genetic trend for CI was -0.01 days/year. Finally, for CI, inbreeding depression was evident; this trait increased when inbreeding increased. These results indicate an important environmental influence on reproductive traits. The heritability estimate for CI suggests that little genetic progress could be achieved through selection. The evidence of inbreeding depression raises the need to control inbreeding to conserve this genetic resource.

scholarly journals Estimation of genetic parameters and genetic trends for reproductive traits in Saanen goats

2013 ◽  
Vol 63 (2-3) ◽  
pp. 269-277 ◽  
Author(s):  
A. Kasap ◽  
B. Mioc ◽  
D. Skorput ◽  
Vesna Pavic ◽  
Z. Antunovic
Keyword(s):  
Genetic Parameters ◽  
Reproductive Traits ◽  
Estimation Of Genetic Parameters ◽  
Genetic Trends

scholarly journals Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle

2019 ◽  
Vol 48 ◽  
Author(s):  
Nicole Colucci Tramonte ◽  
Natalia Vinhal Grupioni ◽  
Nedenia Bonvino Stafuzza ◽  
Diego Gomes Freire Guidolin ◽  
Rodrigo Pelicioni Savegnago ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Beef Cattle ◽  
Genetic Parameters ◽  
Principal Component ◽  
Reproductive Traits ◽  
Component Analysis ◽  
Genetic Trends
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