Rearing of dairy cattle. 4. Effect of concentrate supplementation on the live-weight gain and feed intake of calves offered roughages <i>ad libitum</i>

Leaver, J. D.

doi:10.1017/s0003356100030269

Cited by 30 publications

(13 citation statements)

References 12 publications

(14 reference statements)

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“…At this source there was also a significant and negative interaction between FQ and C (FQ x C), indicating that the supplementary effect of concentrates was dependent on FQ. Similar results have been reported with calves (Leaver, 1973) and beef cattle (Vadiveloo & Holmes, 1979). Milk composition was not significant and it was not possible to calculate fat-corrected milk for the prediction of intake.…”

Section: Validation Of Equationssupporting

confidence: 84%

The prediction of the voluntary feed intake of dairy cows

Vadiveloo

Holmes

1979

J. Agric. Sci.

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Information on the total dry-matter intake (TDMI), concentrates supplied (C), live weight (LW), week of lactation (WL), milk yield (MY) and composition, quality of forage fed to, and parities of, 385 cows from five different sources were assembled to develop appetite prediction equations. The equations were based on multiple regression and least squares constants and were calculated using the data from each source and the data pooled from all sources. The major factors affecting total dry-matter intake (TDMI) were C, LW, WL and MY and for the pooled data these factors explained 73-76% (iJ 2 ) of the total variation in TDMI. The predictive values of some of the equations were tested against independent sets of data and for groups of cows and individual cows, the equations predicted TDMI within +1-1 and 1-6 kg, respectively. The application of the equations in the field is discussed and some suggestions made for increasing the R 2 of future appetite equations.

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Section: Validation Of Equationssupporting

confidence: 84%

The prediction of the voluntary feed intake of dairy cows

Vadiveloo

Holmes

1979

J. Agric. Sci.

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“…Diet supplementation with concentrate for dairy cows is a function of the nutrient concentration in the forage, which in turn is a function of the stage of maturity of the forage (Crampton and Forshaw 1939;Crampton and Jackson 1944 Harvey (1960) and differences between means were tested by linear comparison (Harvey 1960) and multiple range test (Duncan 1955) (1968). Nelson's (1968) Leaver (1973) obtained similar results with hays of different qualities.…”

supporting

confidence: 61%

Effects of Stage of Maturity of Timothy Hay and Concentrate Supplementation on Performance of Lactating Dairy Cows

Vinet¹,

Bouchard²,

St-Laurent³

1980

Can. J. Anim. Sci.

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The effects of concentrate supplementation of timothy hay cut at the late-boot and early-bloom was tested with dairy cows during two feeding and two digestibility trials. The diets for each trial contained the following hay to concentrate ratios: 100:0, 85:15, 70:30 and 55:45. Daily dry matter intake and fat-corrected milk production, respectively, were 15.1, 16.8, 18.6, 19.4 kg; 16.7, 20.7, 23.1, 21.0 kg for the four diets containing early-cut timothy hay and 11.0, 14.7, 17.2, 19.8 kg; 8.4, 10.7, 13.3 and 15.9 kg for the late-cut timothy hay. Percent digestibilities of the four diets containing early-cut and late-cut timothy hay, respectively, were 65.6, 65.6, 66.9, 66.8 and 53.6, 53.6, 60.2, 62.9 for dry matter; 62.5, 63.7, 65.2, 65.3 and 24.0, 39.3, 53.3, 60.0 for nitrogen; 70.3, 70.3, 68.4, 67.8 and 53.7, 53.4, 60.1, 62.6 for gross energy; 66.4, 65.3, 67.1, 66.6 and 55.0, 54.5, 61.4, 63.5 for cell wall constituents; 68.2, 65.8, 64.9, 63.4 and 50.8, 48.2, 52.7, 52.1 for acid detergent fiber. Timothy hay cut at late-boot stage as sole source of feed supported a daily milk production of 16.7 kg compared to 15.9 kg for cows consuming timothy hay cut at late-bloom stage supplemented with 9 kg of concentrate.

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“…Although forage intake and animal performance both increase with increasing digestibility of dry forage, and the magnitude of these increases is usually considerably reduced by supplementation with concentrates (Leaver, 1973;Vadiveloo and Holmes, 1979), there is little information available on the effect of concentrate supplementation on the response in performance fAlso a member of staff of the Department of Agriculture for Northern Ireland and the Queen's University, Belfast.…”

Section: Introductionmentioning

confidence: 99%

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

Steen

McIlmoyle

1982

Anim. Sci.

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A randomized-block experiment has been carried out over 2 consecutive years to examine the effects of frequency of harvesting grass for silage, and level of concentrate supplementation, on the intake and performance of beef cattle. Swards of S24 perennial ryegrass were harvested at 6-, 9-and 12-week intervals throughout the growing season, commencing on 14 May, 4 June and 25 June respectively. The three silages were offered ad libitum with 0, 1, 2 or 3 kg per head per day of cereal-based concentrates to 84 Hereford-cross suckled calves (mean initial live weight 313 kg) in a 3 x 4 factorial design experiment in each year. The treatments were imposed for a mean period of 100 days. The digestible organic matter in the dry-matter values of the silages harvested at 6-, 9-and 12-week intervals were 0-684, 0-646 and 0-607 respectively. The mean silage dry-matter intakes and live-weight gains for the silages harvested at 6-, 9-and 12-week intervals were 4-75, 4-70 and 4-74 (s.e. 0-08) kg/day, and 0-75, 0-67 and 0-52 (s.e. 0-020) kg/day, respectively. The mean silage dry-matter intakes and live-weight gains for the supplement at 0, 1, 2 and 3kg/day were 5-23, 4-79, 4-72 and 4-17 (s.e. 009)kg/day, and 0-38, 0-57, 0-75 and 0-88 (s.e. 0-023) kg/day, respectively. There was a significant interaction between cutting interval and level of supplementation for live-weight gain, the response to supplementation declining as silage digestibility increased.

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Rearing of dairy cattle. 4. Effect of concentrate supplementation on the live-weight gain and feed intake of calves offered roughages ad libitum

Cited by 30 publications

References 12 publications

The prediction of the voluntary feed intake of dairy cows

The prediction of the voluntary feed intake of dairy cows

Effects of Stage of Maturity of Timothy Hay and Concentrate Supplementation on Performance of Lactating Dairy Cows

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

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