scholarly journals Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle

2008 ◽  
Vol 7 (4) ◽  
pp. 1312-1318 ◽  
Author(s):  
J.C.C. Balieiro ◽  
J.P. Eler ◽  
J.B.S. Ferraz ◽  
E.C. Mattos ◽  
C.C. Balieiro
Keyword(s):  
Genetic Parameters ◽  
Reproductive Efficiency ◽  
Productive Life ◽  
Life Traits ◽  
Nellore Cattle

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

Use of productive data to predict length of productive life in Iranian Holstein cattle

2005 ◽  
Vol 2005 ◽  
pp. 126-126
Author(s):  
A. Abdolmohammadi ◽  
M. Moradi Shahrebabak ◽  
S. R. M. Ashtiani
Keyword(s):  
Milk Production ◽  
Genetic Parameters ◽  
Selection Index ◽  
Direct Selection ◽  
Holstein Cattle ◽  
Production Traits ◽  
Milk Production Traits ◽  
Direct Evaluation ◽  
Productive Life ◽  
Selection Of

Improvement of longevity by direct selection of sires based on theirs daughters’ longevity measures is impractical because of a low heritability and generation intervals prolonged by waiting until all cows complete their productive life. As an alternative to direct evaluation of sires for longevity is indirect prediction from genetically correlated production traits measures in the first lactation. The objectives this study were 1) to estimate genetic parameters of longevity and production traits 2) to examine relationships between longevity and first lactation milk production traits and 3) to determine selection index for sires’ longevity based on production traits.

scholarly journals Genetic study of skin thickness and its association with postweaning growth in Nellore cattle: estimation of the genetic parameters

2016 ◽  
Vol 15 (1) ◽  
Author(s):  
A.M. Maiorano ◽  
M.C.S. Oliveira ◽  
J.N.S.G. Cyrillo ◽  
L.G. Albuquerque ◽  
R.A. Curi ◽  
...  
Keyword(s):  
Genetic Study ◽  
Genetic Parameters ◽  
Skin Thickness ◽  
Nellore Cattle

scholarly journals Genetic Parameters and Genome-Wide Association Studies for Anti-Müllerian Hormone Levels and Antral Follicle Populations Measured After Estrus Synchronization in Nellore Cattle

Animals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1185
Author(s):  
Laís Grigoletto ◽  
Miguel Henrique Almeida Santana ◽  
Fabiana Fernandes Bressan ◽  
Joanir Pereira Eler ◽  
Marcelo Fábio Gouveia Nogueira ◽  
...  
Keyword(s):  
Candidate Genes ◽  
Genetic Parameters ◽  
Association Studies ◽  
Antral Follicle ◽  
Genome Wide Association Studies ◽  
Hormone Levels ◽  
Estrous Synchronization ◽  
Nellore Cattle ◽  
Genomic Regions ◽  
Indicator Traits

Reproductive efficiency plays a major role in the long-term sustainability of livestock industries and can be improved through genetic and genomic selection. This study aimed to estimate genetic parameters (heritability and genetic correlation) and identify genomic regions and candidate genes associated with anti-Müllerian hormone levels (AMH) and antral follicle populations measured after estrous synchronization (AFP) in Nellore cattle. The datasets included phenotypic records for 1099 and 289 Nellore females for AFP and AMH, respectively, high-density single nucleotide polymorphism (SNP) genotypes for 944 animals, and 4129 individuals in the pedigree. The heritability estimates for AMH and AFP were 0.28 ± 0.07 and 0.30 ± 0.09, and the traits were highly and positively genetically correlated (rG = 0.81 ± 0.02). These findings indicated that these traits can be improved through selective breeding, and substantial indirect genetic gains are expected by selecting for only one of the two traits. A total of 31 genomic regions were shown to be associated with AMH or AFP, and two genomic regions located on BTA1 (64.9–65.0 Mb and 109.1–109.2 Mb) overlapped between the traits. Various candidate genes were identified to be potentially linked to important biological processes such as ovulation, tissue remodeling, and the immune system. Our findings support the use of AMH and AFP as indicator traits to genetically improve fertility rates in Nellore cattle and identify better oocyte donors.

0360 Genetic parameters and trends for length of productive life and lifetime production efficiency traits in Thai Landrace and Yorkshire sows

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 174-174
Author(s):  
U. Noppibool ◽  
M. A. Elzo ◽  
S. Koonawootrittriron ◽  
T. Suwanasopee
Keyword(s):  
Production Efficiency ◽  
Genetic Parameters ◽  
Productive Life

Genetic parameters for traditional and novel ultrasound carcass traits in Nellore cattle

2022 ◽  
Vol 54 (1) ◽  
Author(s):  
B. S. Marestone ◽  
R. A. A. Torres Junior ◽  
L. O. C. Silva ◽  
G. R. O. Menezes ◽  
C. A. S. D. Muniz ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Carcass Traits ◽  
Nellore Cattle

scholarly journals Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

animal ◽  
2012 ◽  
Vol 6 (1) ◽  
pp. 36-40 ◽  
Author(s):  
D. Barrozo ◽  
M.E. Buzanskas ◽  
J.A. Oliveira ◽  
D.P. Munari ◽  
H.H.R. Neves ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Genetic Parameters ◽  
Reproductive Traits ◽  
Nellore Cattle
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