Varying Energy in a Complete Feed for High-Producing Cows

Escano, J.R.; Rusoff, L. L.

doi:10.3168/jds.s0022-0302(73)85324-x

Cited by 5 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). The decreased efficiency with increased energy concentration of the diet agrees with the results of numerous American workers (Harner & Spahr, 1971;Escano & Rusoff, 1973;Everson et al 1976;Smith et al 1978). The values reported above for diets H and M for weeks 3-10 are relatively close to the value of 0-59 used by the Ministry of Agriculture, Fisheries and Food (1975) and which was assumed to remain constant throughout lactation.…”

Section: Discussionsupporting

confidence: 87%

“…a complete diet could support a milk-fat concentration of 38-9 g/kg with cows. Similar results have also been reported from the U.S.A. (Escano & Rusoff, 1973;Coppock et al 1974). However, it should be noted that with heifers in the present experiment, an increase from 50 to 65% compound in the diet caused a significant decrease in milk-fat concentration.…”

Section: Discussionsupporting

confidence: 86%

“…Earlier work in the U.S.A. also showed clearly the importance of the energy concentration of complete diets in early lactation in achieving high D.M. intake and milk yields | Escano & Rusoff, 1973;Coppock et al 1974).…”

Section: Discussionmentioning

confidence: 92%

“…There is considerable evidence from the U.S.A. and limited information obtained under U.K. conditions which show that the energy concentration of a complete diet has a major influence on milk yield (Escano & Rusoff, 1973;Coppock, Noller & Wolfe, 1974;Akinyele & Spahr, 1975;Marshall & Voigt, 1975;Ministry of Agriculture, Fisheries and Food, 1979). However, there has been considerable debate as to whether or not one or more complete diets should be used during lactation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Complete diets for dairy cows: the effect of energy concentration and change in energy concentration of a complete diet on intake and performance of lactating dairy cows

Phipps¹,

Bines²,

Weller³

et al. 1984

J. Agric. Sci.

View full text Add to dashboard Cite

Ninety-two British Friesians (56 cows and 36 heifers) were divided into two groups during weeks 3-10 of lactation and received ad libitum either complete diet H (65 % concentrates, 35% grass silage, 11-7 MJ ME/kg D.M.) or diet M (50% concentrates, 50% grass silage, 11-2 MJ ME/kg D.M.). In weeks 11-20 half the animals of each group continued to receive the same diet (HH or MM) while the other half were changed from diet H to M (HM) or from diet M to L (ML). Diet L contained 35 % concentrates, 65% grass silage and 10-7 MJ ME/kg D.M. The crude protein concentration of all diets was maintained at about 157 g/kg D.M. by the addition of soya-bean meal to diets M and L.During weeks 3-10 the mean D.M. intake (kg/day), milk yield (kg/day), milk protein (g/kg) and live-weight change (kg/day) for animals on diets H and M were 15-0, 21-7, 33-3, 0-50 and 12-9, 20-2, 31-5, 0-35 respectively. Differences were significant for D.M. intake, milk yield and milk protein concentration. Although milk-fat concentration of cows given diet H (40-2 g/kg) was similar to that of cows given diet M (39-9 g/kg), heifers receiving diet H had a significantly lower value (37-0 g/kg) than those given diet M (39-8 g/kg).When animals were changed from diet H to M or from M to L at week 11, D.M. intake, milk yield and milk-protein concentration decreased. However, milk-fat concentration and live-weight change were generally unaffected.During the complete experimental period, weeks 3-20, animals on treatments HH, HM, MM and ML had mean D.M. intakes and milk yields of 15-3, 14-2, 13-2, 12-4 kg/day and 19-7, 18-5, 17-8, 17-0 kg/day. Milk-protein concentration, was closely related to D.M. intake, but only with heifers did diet H significantly depress milk-fat concentration. The highest live-weight gain was recorded on treatment HH (0-40 kg/day) and the lowost on treatment ML (0-29 kg/day) with intermediate values for treatments HM and MM.In vivo digestibility coefficients of D.M. and organic matter for diet H (0-731, 0-757) were significantly higher than those of diet L (0-707, 0-734) with intermediate values for diet M. However, for acid-detergent fibre the digestibility coefficient for diet H was significantly lower (0-562) than for diet L (0-662). The digestibility coefficients for nitrogen in all three diets were similar.Estimates of mean efficiency of utilization of ME for lactation were made on a weekly basis and were 0-56 and 0-64 for animals on diets H and M in weeks 3-10. During weeks 11-20 the mean values for animals on treatments HH, HM, MM and ML were 0-46, 0-53, 0-51 and 0-59, respectively.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 92%