A Method for Determining the Gross Value of Protein Concentrates

Heiman, Victor; Carver, J. S.; Cook, J. W.

doi:10.3382/ps.0180464

Cited by 60 publications

(15 citation statements)

References 6 publications

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“…The gross value of crab meal was compared to that of commercial fish meal, meat scraps, and casein using the method of Heiman, Carver, and Cook (1939). A depletion diet compounded to contain 8 percent protein, 1 percent calcium, and 0.7 percent phosphorus was fed to White Leghorn day-old cockerels for two weeks, after which test groups of 15 chicks each were fed the experimental diets.…”

Section: Gross Value Method-chick Growthmentioning

confidence: 99%

Crab Meal in Poultry Rations

Lubitz¹,

Fellers²,

Parkhurst³

1943

Poultry Science

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Section: Gross Value Method-chick Growthmentioning

confidence: 99%

Crab Meal in Poultry Rations

Lubitz¹,

Fellers²,

Parkhurst³

1943

Poultry Science

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“…The Gross Protein Value test described by Heiman et al 4 in 1939, with certain modifications, had been used in the Kowett Research Institute for some years previously, and it did in fact fu€fil most of the requirements mentioned above. The only major exception was the level of supplementary protein used and this did fall considerably below the level used in practical rations.…”

Section: Choice Of Methodsmentioning

confidence: 99%

The assessment of nutritive value in protein concentrates by the gross protein value method

Duckworth¹,

Woodham²,

McDonald³

1961

J Sci Food Agric

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The Gross Protein Value technique, modified in certain particulars, has been used to evaluate 171 samples of protein concentrates, obtained from world-wide sources, and including a number of animal by-products and oilseed meals.The assessments demonstrated that in nearly all tliese classes of concentrate the samples on the market differ widely in nutritive value. The work reported indicates the need for rapid laboratory tests which will predict the value of different protein concentrates and the range of samples should provide useful reference standards for this purpose. IntroductionThe problem of devising rations for non-ruminant farm animals in the United Kingdom in which the prptein is adequate in both quantity and quality, is complicated by the diversity of materials on the market. The bulk of the feed may be composed of one or several cereals providing energy and some protein. To this must be added one or.more concentrates in order to increase the protein content and to provide a sufficiency of essential amino-acids, some of which will be in short supply in the cereals. These protein concentrates include animal byproducts such as meat and bone meal, fish meal, and dried skimmed milk, and vegetable materials such as groundnut meal and soya-bean meal.In practice several concentrates may be used together and at present the choice depends largely upon the availability and prevailing price of materials. For example groundnut meal may be replaced by sunflower seed meal if the economic conditions dictate, and at another time both may be replaced by soya-bean meal. Such manipulation is permissible if the various mixtures are equivalent in nutritive value. In view of the differing amino-acid compositions and energy contents of the various types of protein concentrate this equivalence is unlikely, and the difficulty is surmounted by the inclusion of larger quantities of supplementary protein than necessary, in order to provide a ' margin of safety '. Information on ' replacement values ' for individual concentrates would permit the safety margin to be cut down, thereby reducing the price of the product and also ensuring that these valuable commodities be used to their best advantage. Recognised deficiencies in quality with respect to a particular component of a mixture could be remedied either by increasing its level, or by adding another material capable of complementing the effect of the first.The biological evaluation of even a proportion of the possible combinations of cereals and concentrates would be a formidable task. Further the variation in quality between different specimens of the same material would seriously detract from the usefulness of the results obtained. The value of a mixture of two concentrates fed with a cereal basal ration may well be greater than that of an equivalent quantity of either.l In consequence deductions from evaluations of single concentrates must be made with care. In addition, the value of a particular concentrate will be affected by the cereal components present in the diet. Despi...

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“…This diet was fed for 7 days after which the chicks were weighed and divided according to weight into six groups of ten animals each. The total weights of the various groups which averaged 399.5 g, did not differ by more than t 2.6 g. Following the depiction period, the chicks received test diets which were formulated to contain a total of 12% protein, 6% from yellow corn meal and 6 % from defatted rapeseed meal or a rapeseed protein isolate; vita mins and a salt mixture were added, and the balance was made up with equal parts of starch and sugar (10). These diets were fed for 12 days.…”

Section: Methodsmentioning

confidence: 99%

Nutritive Value of Rapeseed Meals and Rapeseed Protein Isolates

Nockrashy¹,

Kiewitt²,

Mangold³

et al. 1975

Ann Nutr Metab

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Defatted meals of two new varieties of rapeseed, Brassica napus, Erglu and Lesira, and protein isolates prepared therefrom, were fed to chicks that had been depleted of their embryonic protein reserve. First, the animals were fed at a 12 % protein level, half of it from rapeseed meal, or a rapeseed protein isolate and, subsequently, at a 20 % level, all of it from rapeseed products. Feed consumption, weight gain and protein efficiency ratio revealed better performance of the protein isolates as compared to the corresponding meals. This is attributed to the favorable amino acid patterns of these isolates and the absence of glucosinolates. Erglu meal, too, is eminently suitable as a supplement to chicken feed, whereas Lesira meal, although its amino acid pattern is adequate and similar to that of Erglu meal, showed detrimental effects, probably due to its high glucosinolate content.

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A Method for Determining the Gross Value of Protein Concentrates

Cited by 60 publications

References 6 publications

Crab Meal in Poultry Rations

Crab Meal in Poultry Rations

The assessment of nutritive value in protein concentrates by the gross protein value method

Nutritive Value of Rapeseed Meals and Rapeseed Protein Isolates

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