Twenty-four years of records (1958-1981) from a commercial Angus ranch were utilized in a population analysis to characterize the herd as a biological unit. The herd averaged 632±129 cows and 123±6 replacement heifers with all replacement heifers and many bulls from within the herd. Life tables were calculated for seven...
Two management systems were evaluated in terms of the effects on
calf growth, on calf weight produced per cow per year, and on reproductive
performance of fall calving cows. The alternative management
systems tested were twin foster calf production and, delayed weaning,
production of single suckled calves weaned at the...
A simulation model capable of execution on a programmable
calculator was developed to study voluntary intake,
liveweight change, and fertility of grade Zebu cows in the
Llanos of Colombia. Organic nitrogen in the diet and meta
bolic weight were used to predict intake; age, liveweight,
and energy concentration were the...
A mathematical model was developed to simulate alternative
selection and crossbreeding strategies for commercial beef production.
Biological and economic constraints were selected to represent
typical pasture production of calves in the Northwest. The
crossbreeding study evaluated the relative economic efficiency of
different 1) mating plans when sire breeds of several...