Protein requirements for dairy heifers

The minimum protein requirement for growing dairy heifers

10.32469/10355/60592 ◽

1918 ◽

Author(s):

◽

Solomon Fine

Keyword(s):

Normal Growth ◽

Farm Animals ◽

Minimum Amount ◽

Protein Requirement ◽

Complete Control ◽

Protein Requirements ◽

Dairy Heifers ◽

Nutritional Factor ◽

Large Farm

Text from page 1: "By minimum protein requirements of growing dairy heifers is meant the least quantity of protein in the ration which will allow normal growth to proceed. A study or investigation leading to a knowledge of the minimum amount of protein to be fed growing dairy heifers, to solve the fundamental problems should be conducted with animals receiving purified food substances, and every nutritional factor should be under complete control. It is obvious that this is entirely impractical with such large farm animals as dairy heifers. Consequently the results cannot be entirely satisfactory from a scientific standpoint. Yet if such experiments are properly controlled they should give results of value both scientifically and practically."

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Experiments on the use of home-grown foods for milk production. V. The protein requirements of growing dairy heifers

The Journal of Agricultural Science ◽

10.1017/s0021859600024047 ◽

1946 ◽

Vol 36 (4) ◽

pp. 301-309 ◽

Cited By ~ 5

Author(s):

K. L. Blaxter ◽

H. A. Price

Keyword(s):

Milk Production ◽

Protein Level ◽

Optimal Level ◽

Food Shortage ◽

Protein Requirements ◽

Growing Stock ◽

Dairy Heifers ◽

Young Cattle ◽

Minimum Estimate ◽

The One

1. The changes which have occurred in the nutrition of young dairy stock are discussed. It is emphasized that any food shortage of a farm affects young cattle before the rations of the cows are reduced.2. An estimate of minimum protein level is developed using Mitchell's (1926) method.3. An experiment designed to show the optimal level of protein in the ration for growing stock showed a difference between this minimum estimate and the optimal. Some considerable economy in protein can, however, be effected in Wood & Woodman's (1936) standard is the one normally used to calculate rations.4. The growth of young cattle on protein supplemented wartime dietaries of straw is shown to be below that of heifers fed the rations more normal in peace time.5. Stunted cattle undergrown by 7–8 months when 18 months to 2 years old have been found. This has been attributed to the effects of wartime rations.

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Experiments on the nutrition of the dairy heifer: I. Protein requirements of yearling stock

The Journal of Agricultural Science ◽

10.1017/s0021859600038430 ◽

1957 ◽

Vol 49 (4) ◽

pp. 435-445 ◽

Cited By ~ 9

Author(s):

G. L. Bailey ◽

W. H. Broster

Keyword(s):

Weight Gain ◽

Crude Protein ◽

Live Weight ◽

Rapid Decline ◽

Published Data ◽

Short Term ◽

Protein Supplements ◽

Live Weight Gain ◽

Protein Requirements ◽

Dairy Heifers

The literature on the protein requirements of young dairy heifers has been discussed and the wide variations noted, both in quantities estimated for particular live-weight ranges and in the suggested trends of requirements with live weight.Short-term trials have been conducted in which the effect of variation in protein intake on rate of live-weight gain of dairy heifers of various ages was studied.The response to increments of protein in the ration was found to be curvilinear with a rapid decline in response above critical levels of intake. This level varied with the live weight of the animal, being 0·8 lb. crude protein at 300 lb. live weight and 1·0 lb. at 400 and 500 lb. when rations based on hay, decorticated ground-nut meal and flaked maize were fed.These levels are somewhat lower than estimates of protein requirements quoted in the literature, though the trend indicated in them agrees with some of the published data.No marked difference was observed between the values of decorticated ground-nut meal and white fish meal as protein supplements. Urea was inferior to decorticated ground-nut meal.The overall depressant effect of straw on rate of live-weight gain is demonstrated and discussed.

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