677. The effect of variations in nutrient intake upon the yield and composition of milk: I. Variations in the amount and type of concentrates fed in winter rations

Burt, A. W. A.

doi:10.1017/s0022029900008827

Cited by 21 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…additional s.E.) upon milk yield (lb./day) was + 0-035 ± 0-04 which is in very close agreement with the value previously reported (23). The predicted response ranged from 0-6 lb.…”

Section: Discussionsupporting

confidence: 91%

“…The response to a standard amount of additional concentrates was significantly and positively related to milk yield, and there were no independent effects due to stage of lactation. These observations confirm the results of a previous analysis of a series of conventional feeding experiments (23), and the regressions contrast with the results of Jensen et a£. (15) who reported that responses to increased feeding were very similar in 'good' and 'poor' producing cows when the comparison was made at the same percentage of the Haecker production standards for total digestible nutrients.…”

Section: Discussionsupporting

confidence: 88%

See 1 more Smart Citation

678. The effect of variations in nutrient intake upon the yield and composition of milk II. Factors affecting rate of eating roughage and responses to an increase in the amount of concentrates fed

Burt

1957

Journal of Dairy Research

Self Cite

View full text Add to dashboard Cite

With 5 Figures)The practical application of the results of closely controlled experiments on the effects of different levels of concentrate intake may be affected by the lack of control of roughage intakes of individual cows which occurs in most dairy herds. Individual cows show considerable variation in their ability to ingest and utilize roughage (1,2,3), which, together with the effects of competition, can give rise to considerable differences in individual plane of nutrition when roughages are rationed on a 'herd' basis. Responses to additional concentrates might therefore be expected to be maximal in those cows which are on the lower planes of nutrition due to low roughage intakes. The experiment to be described was therefore designed in an attempt to assess the importance of the effects of variations in individual rates of eating roughage upon responses to a standard increase in the concentrate ration under a system of feeding and management commonly used in dairy herds in the South of England. MATERIAL AND METHODSTwenty-nine Ayrshire cattle were used. They were divided into two groups (fourteen cows and fifteen heifers) and were housed in separate but adjacent covered yards fitted with mangers for individual feeding. The animals were given a daily 3 hr. exercise period on a bare paddock and were milked in a milking parlour. No concentrates were fed in the milking parlour. The daily feeding routine was as follows: 4.15 a.m., half of the daily allowance of concentrates; 5.0 a.m., milking; 6.30-7.30 a.m., half the daily allowance of hay; 9.45-11.0 a.m., marrowstem kale; 11.0 a.m.-2.0 p.m., exercise; 2.45 p.m., the other half of the concentrates; 4.0 p.m., milking; 5.0-6.0 p.m. the other half of the hay.The animals had access to water at all times except when tied in the yokes for feeding. Table 1. Mean age, stage of lactation and milk yield at the start of the experiment Mean S.D.

show abstract

“…additional s.E.) upon milk yield (lb./day) was + 0-035 ± 0-04 which is in very close agreement with the value previously reported (23). The predicted response ranged from 0-6 lb.…”

Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 88%

678. The effect of variations in nutrient intake upon the yield and composition of milk II. Factors affecting rate of eating roughage and responses to an increase in the amount of concentrates fed

Burt

1957

Journal of Dairy Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The effect of the plane of energy nutrition of the cow on the S.N.F. content of milk, as demonstrated in this and earlier work (Burt, 19573;Dijkstra, 1942;Holmes, Reid, MacLusky, Waite & Watson, 1957;Rook, 1953;Rowland, 1946), is represented in Fig. 3.…”

Section: Discussionmentioning

confidence: 52%

The effect of the plane of energy nutrition of the cow on the secretion in milk of the constituents of the solids-not-fat fraction and on the concentrations of certain blood-plasma constituents

Rook¹

1961

Br J Nutr

View full text Add to dashboard Cite

An increase in the plane of energy nutrition of the cow is known to increase both the yield and the solids-not-fat (s.N.F.) content of milk: a decrease in fat content also occurs but there is little effect on the yield of fat (for review of literature, see Burt, 1957 a). Though small depressions in milk lactose content occur with underfeeding (Rowland, 1946), any change in S.N.F. content is largely due to a change in the protein content of the milk, and thus an increase in the net energy supply to the cow gives rise to a specific increase in the synthesis of protein by the mammary gland. The metabolic pathways by which this effect and the increase in milk yield are achieved are, however, as yet unknown.The experiments described here were designed to investigate the effect of the plane of energy nutrition of the cow on the amounts of the individual proteins in milk and on the concentrations of certain blood-plasma constituents that are possibly of importance in the synthesis of proteins within the mammary gland.Two experiments have been made. In the first, the variations in plane of energy nutrition imposed were within the range of feeding levels normally experienced in practice, whereas in the second extreme differences in plane of energy nutrition were compared in an attempt to exaggerate any changes in blood composition associated with change of level of feeding. E X P E R I M E N T A L

show abstract

“…Concentrate feeding to buffaloes receiving maize silage ad libitum resulted in a significant increase in milk yield which could be explained on the basis of increased intake of D.M. and TDN (Jensen et al 1942;Burt, 1957;Laird & Walker-Love, 1962;Jackson & Gupta, 1971). The SNF content of milk was higher for animals on supplemented rations which is understandable in view of the higher plane of nutrition consequent upon supplementary feeding (Rook, 1961;Huber & Bowman, 1966).…”

Section: Discussionmentioning

confidence: 99%

Some factors affecting voluntary food intake in buffaloes. 3. Effect of concentrate feeding on intake of roughages fed to lactating buffaloes

Taparia¹,

Sharma²

1980

J. Agric. Sci.

View full text Add to dashboard Cite

Three experiments, each with six lactating Mehsana-Surti buffaloes, were conducted to investigate the effect of supplementary feeding of concentrates on intake of basal rations of berseem hay, maize silage or wheat straw and on the total intake of feeds in 3 x 3 latin square designs.In the berseem hay experiment, concentrate feeding at 16-8 or 26-1% of hay drymatter intake (DMI) resulted in a decrease of hay DMI by 0-77 and 0-65 kg/kg concentrate D.M., respectively. Intake of total digestible nutrients (TDN) and digestible crude protein (DCP) of buffaloes receiving concentrates in addition to hay were not different from those receiving hay alone. The possibility of some chemical factor limiting feed intake has been indicated for these rations in buffaloes. Supplementary feeding had a little effect on milk production.In the maize silage experiment, concentrate feeding at 14-5 and 27-7% of the silage DMI resulted in a similar increase of total DMI, thereby increasing the TDN intake and DCP intake. Appreciable increases in milk yield and solids-not-fat (SNF) content due to supplementation were noted, although milk-fat content tended to be low.Voluntary intake of rations comprising wheat straw fed free choice with three levels of concentrates at 28-7, 48-0 and 68-8 % of straw DMI was studied in the third experiment. Concentrate supplementation had little effect on straw DMI with the result that intakes of total D.M., TDN and DCP on the medium and high proportions of supplements were higher than those on the low proportion. The milk yield, of buffaloes receiving medium and high proportions of concentrates with wheat straw increased significantly over those receiving the low proportion of concentrates. The SNF and milk-fat contents were similar on all the three treatments. The implication of physical factors limiting intake is discussed in the case of maize silage and wheat straw diets.The lactating buffaloes failed to maintain their weights on either sole berseem hay or sole maize silage rations. Supplementary feeding helped buffaloes to register small weight gains on hay rations and substantial gains on silage rations. The buffaloes on wheat straw fed with three proportions of concentrates tended to put on a little weight. Multiple regression using pooled data of Expts 1 and 3 showed that the partial regression coefficient of metabolic body weight (kgW 076 ) on TDN intake was not significant but that of 6 % fat-corrected milk on TDN intake was, suggesting a close relationship between milk yield and food intake.replacement of basal roughage ration, response is likely to be low. Supplementary feeding of concentrates to lactat-Generally total intake of D.M. increases when a ing buffaloes receiving roughages as basal feeds is a basal ration fed ad libitum is supplemented with common practice in India for milk production. The concentrates. The extent of the increase in dryproduction response to supplementary feeding is matter intake (DMI), however, varies because the likely to be greater if the supplements increase the co...

show abstract

677. The effect of variations in nutrient intake upon the yield and composition of milk: I. Variations in the amount and type of concentrates fed in winter rations

Cited by 21 publications

References 16 publications

678. The effect of variations in nutrient intake upon the yield and composition of milk II. Factors affecting rate of eating roughage and responses to an increase in the amount of concentrates fed

678. The effect of variations in nutrient intake upon the yield and composition of milk II. Factors affecting rate of eating roughage and responses to an increase in the amount of concentrates fed

The effect of the plane of energy nutrition of the cow on the secretion in milk of the constituents of the solids-not-fat fraction and on the concentrations of certain blood-plasma constituents

Some factors affecting voluntary food intake in buffaloes. 3. Effect of concentrate feeding on intake of roughages fed to lactating buffaloes

Contact Info

Product

Resources

About