Document Detail

Comparison of Landim and Africander cattle in southern Mozambique: II. Female fertility, reproduction, and beef offtake.
MedLine Citation:
PMID:  8655425     Owner:  NLM     Status:  MEDLINE    
Fertility and reproductive performance of Landim and Africander females were compared using data collected from 1968 to 1981 at the Chobela Research Station in Mozambique. Breeds were managed together and grouped by age and sex, except when separated for breeding. Traits were relative fertility (probability of fertile females calving from the first breeding season), age at first calving, first calving interval, and subsequent calving intervals. calving rates were tested by x2 procedures with equal expected frequencies in each subclass. The statistical model included breed, the random effect of sire within breed, year-season of birth or calving, and calving group within breed. Landim survivors were more fertile (P < .05) than the Africander ones throughout their recorded lifetimes. Landim females were 1.32 +/- .21 mo (or 3%) younger at first calving and had a 48 +/- 12 d (or 11%) shorter interval between first and second calving than the Africander average of 473 d. When reproductive and growth information were combined to compute an annual index of beef offtake expressed as 18-mo calf yield per unit of dam's weight at first calving, Landim cows annually yielded 30% more calf weight (P < .001) than Africander cows per kilogram of their own body maintenance despite lighter body weights at 18 mo. Superior fertility of Landim females led to greater beef offtake from higher calving rates. Greater fertility and relatively less feed to maintain the reproducing herd are probable mechanisms for a population to adapt to nutrient-limiting environments such as the one in southern Mozambique.
J G Carvalheira; R W Blake; E J Pollak; P J Van Soest
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  73     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1995 Dec 
Date Detail:
Created Date:  1996-08-01     Completed Date:  1996-08-01     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:  3527-33     Citation Subset:  IM    
Cornell University, Ithaca, NY 14853, USA.
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MeSH Terms
Aging / physiology
Body Composition / genetics,  physiology
Body Weight / genetics,  physiology
Cattle / genetics,  physiology*
Fertility / genetics,  physiology*
Meat / standards*
Reproduction / genetics,  physiology*

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