Feed intake and production in dairy breeds dependent on the ration.

Abstract

In 2 lactations and the dry period, with a changeover between lactations, Dutch Black Pied (DBP), Holstein-Friesian (HF) and DBP/HF crosses with 50% and 75% HF were offered roughage to appetite and 570 or 2310 kg concentrates per lactation. Energy intakes in the 2 lactations were 21 and 27% lower and roughage intakes 22 and 17% higher for cows given low-concentrates vs. high-concentrates; there was no carryover effect from lactation into the dry period when all cows received the same amount of concentrates. HF cows had higher roughage intakes than DBP by 4-5% but differences were only significant in late lactation. HF cows gave 10.1 and 7.2% (594 and 407 kg) more milk and 7.7 and 3.7% more milk energy than DBP cows in the 2 lactations resp.; this contrasts with a yield superiority of HF cows by 15% (974 kg) in the preceding lactation when concentrates were given according to milk yield. Milk yield was 20% (1250 kg) higher with high- than with low-concentrate; a carryover effect was noted at the beginning of the 2nd lactation. Efficiency of energy conversion to milk yield was significantly affected by ration at the beginning of lactation. Breed x ration interaction effects were not significant for intake or milk yield. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Effect of amount and composition of feed given over three lactations on the performance of the dairy cow

“…In the experiments by Wiktorsson (1971Wiktorsson ( , 1979 and Korver (1982) live weight change was affected by inter-lactation treatment sequences in the same manner as in the present experiment and that of Broster et al (1985). A compensatory feed utilization pattern on the lower level of feeding was demonstrated that in fact commenced in the latter stages of the first lactation.…”

“…Regarding residual effects on milk production, Wiktorsson (1979) and Korver (1982) observed small adverse effects from underfeeding in the previous lactation. Earlier fragmentary evidence (sec summary by Broster, 1972) suggested that a whole lactation was required to recover from a lactation of underfeeding.…”

Reviews of the progress of Dairy Science: Long term effects of plane of nutrition on the performance of the dairy cow

“…The benefit diminished as the lactation proceeded. Korver (1982) likewise found an advantage to solids yields from additional compound feed, but here the advantage increased as the lactation proceeded. In the trial by 0stergaard (1979a, b) neither protein nor fat concentration in the milk was affected by the treatments; in the trial by Korver (1982) protein concentration tended to be higher with the more generous compound allowance, but fat concentration was favoured by the low compound (high forage) diet.…”

“…Wiktorrson (1971a) in Sweden reported a residual effect from higher intensity of feeding in early lactation. In 2 large scale trials involving independent variation of protein and energy intake (Krohn & Andersen, 1976, residual effects were observed following differences in protein intake (see p. 169) but not following variation in energy allowance. In the earlier trial (1976) they recorded a small negative immediate effect from very generous energy allowances (16 feed units/d at FCM yield of about 26 kg/d).…”

“…access to silage. Korver (1982) compared the effect of high v. low compound allowances over the lactation with ad lib. forage, using markedly different compound allowances.…”