Document Detail


Onset of puberty in heifers of diverse beef breeds and crosses.
MedLine Citation:
PMID:  7174548     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Puberty traits of straightbred and crossbred heifers (n = 301) were evaluated under pasture conditions. Breed groups represented were straightbred Hereford and Red Poll, reciprocal crosses of these two breeds, Angus X Hereford, Angus X Charolais-Cross, Brahman X Hereford and Brahman X Angus. Breed group was an important (P less than .01) source of variation in heifer weights and in age at puberty. Straight-bred Red Poll and Red Poll cross heifers were youngest at puberty, Angus X Hereford and Angus X Charolais-Cross were intermediate, and straightbred Hereford and Brahman crosses were oldest at the onset of puberty. At the beginning of their first mating season at 19.5 mo of age, 96% of the straightbred Red Polls, 95% of Red Poll crosses, 81% of Angus X Herefords, 89% of Angus X Charolais-Crosses, 68% of straightbred Herefords, 48% of Brahman X Herefords and 74% of the Brahman X Angus had attained puberty. Results of a diallel analysis of Hereford-Red Pool matings indicated that maternal influence of the Red Poll breed was superior (P less than .01) to Herefords for body weight up to 24 mo of age and incidence of puberty at 11.5 mo. Red Polls also exceeded Herefords in direct effects for puberty percentage at 11.5, 15 and 19.5 mo of age. Heterosis was significant for puberty percentage and weight. Breed group differences in pregnancy rate at 24 mo were not significantly.
Authors:
J S Dow; J D Moore; C M Bailey; W D Foote
Related Documents :
22999808 - Walking exercise response to bronchodilation in mild copd: a randomized trial.
23778768 - Effects of short-term isokinetic training with reciprocal knee extensors agonist and an...
24311228 - Response of end tidal co2 pressure to impulse exercise.
23001918 - Expression of the irisin precursor fndc5 in skeletal muscle correlates with aerobic exe...
1555208 - Effect of voluntary exercise on azoxymethane-induced hepatocarcinogenesis in male f344 ...
287998 - Fibrositic myofascial pain in intermittent claudication. effect of anesthetic block of ...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  55     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1982 Nov 
Date Detail:
Created Date:  1983-02-14     Completed Date:  1983-02-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1041-7     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Body Weight
Cattle / genetics*,  physiology
Crosses, Genetic
Female
Sexual Behavior, Animal
Sexual Maturation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Genetic parameters for testes size and sperm number in Hereford bulls.
Next Document:  Trenbolone, estradiol-17 beta and estrone levels in plasma and tissues and live weight gains of heif...