Estimation of genetic parameters and effects of cytoplasmic line on scrotal circumference and semen quality traits in Angus bulls

2011 ◽  
Vol 89 (3) ◽  
pp. 693-698 ◽  
Author(s):  
A. J. Garmyn ◽  
D. W. Moser ◽  
R. A. Christmas ◽  
J. Minick Bormann
Keyword(s):  
Genetic Parameters ◽  
Semen Quality ◽  
Quality Traits ◽  
Scrotal Circumference ◽  
Estimation Of Genetic Parameters

scholarly journals 96 Estimation of the genetic parameters of beef bull semen attributes

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 26-26
Author(s):  
Madison L Butler ◽  
Jennifer M Bormann ◽  
Robert L Weaber ◽  
David M Grieger ◽  
Megan M Rolf
Keyword(s):  
Fixed Effects ◽  
Semen Quality ◽  
Critical Factor ◽  
Production Costs ◽  
Quality Traits ◽  
Forward Selection ◽  
Bull Semen ◽  
Scrotal Circumference ◽  
Beef Bull ◽  
Heritability Estimates

Abstract Fertility is a critical factor in cattle production because it directly relates to producing offspring to offset production costs. A number of semen attributes are believed to affect fertility and are frequently measured as part of routine breeding soundness exams or semen collection procedures. The objective of this study was to estimate the variance components for different semen quantity and quality traits that may influence fertility using phenotypes collected on 369 Simmental bulls. A total of 7,436 bull collection records including volume and concentration were obtained from two bull studs and evaluated utilizing a linear univariate animal model with repeated records. The five-generation pedigree used in the analysis consisted of 3,336 sires and 7,225 dams. Volume is the total amount of ejaculate and measured as milliliters of total ejaculate. Volume measurements ranged from 0.100 to 41.30 milliliters, with an average of 7.599 milliliters. Concentration is a measurement of millions of spermatozoa per milliliter. Concentration measurements ranged from 10 to 3,651 with an average of 1,053 million spermatozoa per milliliter. Fixed effects were included in the model if the effect was significant (P ≤ 0.05) for either backward or forward selection. Fixed effects included bull owner, collection center, location within center, collection day within year as a Julian day, collection year fit as class variables. Fixed effects fit as covariates included age of bull at collection (linear and quadratic), days since previous collection (linear and quadratic), and scrotal circumference (quadratic). Heritability estimates of volume and concentration were 0.43 ± 0.14 and 0.40 ± 0.15. These moderate heritability estimates indicate genetic improvement can be made in beef bull semen quality traits through selection.

scholarly journals Estimation of genetic parameters related to morphoagronomic and fruit quality traits of papaya

2008 ◽  
Vol 8 (1) ◽  
pp. 65-73 ◽  
Author(s):  
F.F. Silva ◽  
M.G. Pereira ◽  
H.C.C. Ramos ◽  
P.C. Damasceno Junior ◽  
T.N.S. Pereira ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Genetic Parameters ◽  
Quality Traits ◽  
Fruit Quality Traits ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for body weights, scrotal circumference, and testicular volume measured at different ages in Nellore cattle1

2010 ◽  
Vol 88 (4) ◽  
pp. 1215-1219 ◽  
Author(s):  
A. A. Boligon ◽  
J. A. V. Silva ◽  
R. C. Sesana ◽  
J. C. Sesana ◽  
J. B. Junqueira ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Testicular Volume ◽  
Scrotal Circumference ◽  
Body Weights ◽  
Different Ages ◽  
Estimation Of Genetic Parameters

Relationships between feed efficiency, scrotal circumference, and semen quality traits in yearling bulls

2012 ◽  
Vol 90 (11) ◽  
pp. 3937-3944 ◽  
Author(s):  
A. N. Hafla ◽  
P. A. Lancaster ◽  
G. E. Carstens ◽  
D. W. Forrest ◽  
J. T. Fox ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Semen Quality ◽  
Quality Traits ◽  
Scrotal Circumference
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