Abstract
ABSTRACTThe objective of the study was to evaluate the effect of energy sources on milk production and reproduction of dairy cows on a pasture-based feeding system. Following parturition, 201 Holstein cows from the Elsenburg herd were fed ad libitum cultivated irrigated kikuyu-ryegrass pastures for 22 weeks. Cows were divided into three groups according to concentrate supplementation, of which the energy was provided by starch and/or fat. These were grouped according to parity, body live weight and milk yield of previous lactation. The control consisted of low levels of standard supplement while treatments consisted of supplements of high starch-low fat (HSLF) and high starch-low fat low starch-high fat (HSLF-LSHF) given to cows on pastures. Treatment P-HSLF was a glucogenic regime made of maize. Treatment P-HSLF-LSHF was a high starch/high fat combination treatment, whereby a glucogenic diet was offered for the first 60 days of lactation as per treatment P-HSLF and followed from 61 to 154 days by a lipog...
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