Metabolizable energy for maintenance of beef-type Bos taurus and Bos indicus x Bos taurus cows in a dry, temperate climate.
Metabolizable energy for maintenance (MEm) was estimated using 123 mature cows of eight diverse breed groups. Cows in each breed group were allotted at random 1) to limit-feeding to approximate maintenance or 2) to ad libitum access to feed. The MEm values were calculated by regression of change in body energy on ME intake. The MEm values for mature Hereford, Red Poll, Hereford x Red Poll, Red Poll x Hereford, Angus x Hereford, Angus x Charolais, Brahman x Hereford, and Brahman x Angus breed types were as follows: 145, 169, 148, 149, 144, 152, 139, and 143 kcal.kg-.75.d-1, respectively. Bos indicus-cross cows ranked lowest for MEm/kg.75. Angus x Hereford cows averaged highest in terms of grams of calf weaned per mature female exposed divided by yearly MEm requirement. Hereford x Red Poll reciprocal crosses on average required 640 kcal less total daily MEm per animal than Hereford and Red Poll straightbreds.
Reid
C R
CR
University of Nevada, Reno 89557.
Bailey
C M
CM
Judkins
M B
MB
D000273:Adipose Tissue / Q000254:growth & development; D000821:Animal Feed; D000818:Animals; D001823:Body Composition / Q000235:genetics; D001947:Breeding; D002417:Cattle / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D002980:Climate; D003433:Crosses, Genetic; D004435:Eating / Q000235:genetics; D002149:Energy Intake / Q000235:genetics*; D004734:Energy Metabolism / Q000235:genetics*; D005260:Female; D008297:Male; D024510:Muscle Development; D009505:Nevada; D011897:Random Allocation; D015430:Weight Gain / Q000235:genetics