Genetic analysis of female reproductive efficiency, scrotal circumference and growth traits in Nelore cattle

2019 ◽  
Vol 128 ◽  
pp. 47-53 ◽  
Author(s):  
P.I. Schmidt ◽  
G.S. Campos ◽  
V.M. Roso ◽  
F.R.P. Souza ◽  
A.A. Boligon
Keyword(s):  
Genetic Analysis ◽  
Growth Traits ◽  
Reproductive Efficiency ◽  
Scrotal Circumference ◽  
Nelore Cattle

Genetic associations between age at first calving and heifer body weight and scrotal circumference in Nelore cattle

2009 ◽  
Vol 126 (5) ◽  
pp. 387-393 ◽  
Author(s):  
D.A. Grossi ◽  
G.C. Venturini ◽  
C.C.P. Paz ◽  
L.A.F. Bezerra ◽  
R.B. Lôbo ◽  
...  
Keyword(s):  
Body Weight ◽  
Genetic Associations ◽  
Age At First Calving ◽  
Scrotal Circumference ◽  
Nelore Cattle

scholarly journals Genetic improvement and population structure of the Nelore breed in Northern Brazil

2010 ◽  
Vol 45 (10) ◽  
pp. 1109-1116 ◽  
Author(s):  
Carlos Henrique Mendes Malhado ◽  
Paulo Luiz Souza Carneiro ◽  
Ana Claudia Mendes Malhado ◽  
Raimundo Martins Filho ◽  
Riccardo Bozzi ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Variability ◽  
Genetic Improvement ◽  
Selective Breeding ◽  
Growth Traits ◽  
Management Strategies ◽  
Pedigree Information ◽  
Effective Number ◽  
Northern Brazil ◽  
Nelore Cattle

The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.

Comparison of methods for predicting yearling scrotal circumference and correlations of scrotal circumference to growth traits in beef bulls

1991 ◽  
Vol 69 (7) ◽  
pp. 2711-2720 ◽  
Author(s):  
S. L. Pratt ◽  
J. C. Spitzer ◽  
H. W. Webster ◽  
H. D. Hupp ◽  
W. C. Bridges
Keyword(s):  
Growth Traits ◽  
Comparison Of Methods ◽  
Scrotal Circumference ◽  
Beef Bulls

scholarly journals Genetic analysis of growth traits in IranianMakuiesheep breed

2012 ◽  
Vol 11 (1) ◽  
pp. e18 ◽  
Author(s):  
Shoja Jafari ◽  
Ali Hashemi ◽  
Ghader Manafiazar ◽  
Reza Darvishzadeh ◽  
Sarrain Razzagzadeh ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Growth Traits

Selection for cow lifetime pregnancy rate using bull and heifer growth and reproductive traits in composite cattle

2000 ◽  
Vol 80 (3) ◽  
pp. 507-510 ◽  
Author(s):  
P. B. Mwansa ◽  
R. A. Kemp ◽  
D. H. Crews Jr ◽  
J. P. Kastelic ◽  
D. R. C. Bailey ◽  
...  
Keyword(s):  
Birth Weight ◽  
Key Words ◽  
Pregnancy Rate ◽  
Growth Traits ◽  
Genetic Correlations ◽  
Reproductive Traits ◽  
Genetic Change ◽  
Direct Selection ◽  
Scrotal Circumference ◽  
Selection For

Genetic correlations of lifetime pregnancy rate with bull and heifer growth and reproductive traits in a beef composite population were estimated. Yearling scrotal circumference had an unfavorable genetic correlation (rg = −0.25) while yearling tonometer score was favorably related (rg = 0.22) to lifetime pregnancy rate. Heifer pregnancy rate, birth weight, weaning weight, yearling weight and age at puberty in heifers had significant genetic correlations (rg = 0.97, 0.58, 0.57, 0.33 and −0.21, respectively) with lifetime pregnancy rate. Lifetime pregnancy rate may be successfully predicted by easy-to-measure heifer growth traits. Using indices including scrotal and heifer growth traits, annual genetic change in lifetime pregnancy rate may be increased 3.1 times compared with direct selection. Key words: Scrotal circumference, tonometer, pregnancy, reproduction, puberty

Genetic associations between accumulated productivity, and reproductive and growth traits in Nelore cattle

2008 ◽  
Vol 117 (2-3) ◽  
pp. 139-146 ◽  
Author(s):  
D.A. Grossi ◽  
O.G. Frizzas ◽  
C.C.P. Paz ◽  
L.A.F. Bezerra ◽  
R.B. Lôbo ◽  
...  
Keyword(s):  
Growth Traits ◽  
Genetic Associations ◽  
Nelore Cattle

scholarly journals Genetic trends for mature body weight, visual scores, and growth traits in Nellore cattle

2017 ◽  
Vol 47 (3) ◽  
Author(s):  
Celso Koetz Júnior ◽  
◽  
Vanerlei Mozaquatro Roso ◽  
Luís Afonso Marques Claus ◽  
Rui Paulo Lopes de Oliveira ◽  
...  
Keyword(s):  
Birth Weight ◽  
Variance Components ◽  
Production Systems ◽  
Growth Traits ◽  
Selection Index ◽  
Economic Traits ◽  
Genetic Progress ◽  
Scrotal Circumference ◽  
Nellore Cattle ◽  
Genetic Trends

ABSTRACT: Mature weight (MW) of cows is related to the costs of their production. Usually, cows with moderate MW are more efficient in challenging environments, such as those available in the production systems in Brazil. In the present study, the selection index comprises the following traits: conformation, finishing precocity, musculature at weaning (WC, WP, WM) yearling (YC, YP and YM), scrotal circumference at yearling (SC), days to gain 160kg from birth to weaning (D160) and 240kg after weaning (D240). This are related to birth weight gain at weaning (WG) and from weaning to yearling (YG). The mature (MW) and birth weight (BW) traits were not considered in the selection index. The aim of this study was to estimate the values for the genetic trends (GT) of some important selection (MW) and economic traits (BW). A bi-character analysis of MW and other characteristics was performed to estimate the (co)variance components and genetic parameters. The GT results obtained for MW were null (0.0065% or 0.02718kg per year) in the period 1990-2007. The GT values were determined for BW (-0.0650% or -0.02017kg), WG (0.0758% or 0.0865kg), YG (0.1051% or 0.11377kg), and MW (0.0393% or 0.11276kg) per year. The visual score values (in score units) were also determined for GTat weaning [WC (0.2310%; 0.00707), WP (0.3624%; 0.3623%),aWM (0.01149; 0.01087)] yearling [YC (0.3256%; 0.00990), YP (0.4795%; 0.01496),YM (0.5041%; 0.01457)] per year. Index-based selection was effective to promote genetic progress in WG, WC, WP, WM, YG, YC, YP, and YM characteristics keeping BW and MW constant.

Genetic analysis of growth, visual scores, height, and carcass traits in Nelore cattle

2021 ◽  
Vol 92 (1) ◽  
Author(s):  
Daniel Duarte Silveira ◽  
Patrícia Iana Schmidt ◽  
Gabriel Soares Campos ◽  
Lucas Vargas ◽  
Fabio Ricardo Pablos Souza ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Carcass Traits ◽  
Nelore Cattle
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