Low Erucic Acid, Low Glucosinolate Rapeseed Meal, with and without Added Gums in the Layer Diet

March, B. E.; Bragg, D. B.; Soong, Raymond

doi:10.3382/ps.0571599

Cited by 5 publications

(4 citation statements)

References 14 publications

(17 reference statements)

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“…The lack of effect on egg size of RSM is contrary to earlier observations that egg weight is reduced when RSM is fed to layers (Summers et al, 1969;March et al, 1972March et al, , 1978. It is likely that the nutritional characteristics of rapeseed Brassica napus cv.…”

Section: Discussioncontrasting

confidence: 83%

“…More recently, March and MacMillan (1979) reported that excreta from chicks fed rapeseed meal as the source of supplementary protein contained a lower proportion of lipid in the form of soap fatty acids than when soybean meal was the dietary protein supplement. It may also be observed that laying birds fed diets containing rapeseed meal tend to lay smaller eggs than are laid by birds fed diets containing soybean meal (Summers et al, 1969;March et «/., 1972March et «/., , 1978.…”

Section: Introductionmentioning

confidence: 93%

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Dietary Limestone Versus Extra-Dietary Oyster Shell as Calcium Supplements to Different Layer Diets

March

Amin

1981

Poultry Science

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Hens were given supplementary calcium in the form of 5.7% dietary limestone or oyster shell ad libitum separately from the diet. The two calcium sources were given as supplements to four different diets; wheat-based diets containing soybean meal (SBM) or rapeseed meal (RSM) as the source of supplementary protein and either tallow or corn oil as a fat supplement. Over the 20 weeks of the experiment there were no differences in the rates of production of the birds among the eight experimental treatments. Yolk weight was reduced when the hens fed the diets with tallow as the supplementary fat received their supplementary calcium as oyster shell. When the 5.7% of supplementary limestone was exluded from the weight of feed consumed by the hens given all their calcium mixed into the diet, there was no difference in the amount of feed consumed by the birds on the two systems of calcium feeding. The efficiency of feed conversion to egg meat production was likewise similar for both systems of calcium feeding under the different dietary treatments imposed. Regardless of the composition of the diet, shell weight per unit surface area was greater for the eggs laid by the birds fed oyster shell. (

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Section: Discussioncontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 93%

Dietary Limestone Versus Extra-Dietary Oyster Shell as Calcium Supplements to Different Layer Diets

March

Amin

1981

Poultry Science

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“…Leeson et al (1911) concluded that no deleterious effects accrued from feeding laying birds diets containing RSM to which had been added 1.57o gums. In another study March et al (1978) liBased on the data of Hubbell (1980 Leeson et al (1977), who reported that the addition of SBG or RSG to the diet of laying hens had no effect on body weight but resulted in significantly smaller eggs.…”

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confidence: 99%

Performance of Laying Hens Fed Diets Containing Soybean Gums, Rapeseed Gums or Rapeseed Meals With and Without Gums

Hulan¹,

Proudfoot²

1981

Can. J. Anim. Sci.

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“…It was concluded that while the incidence of LH varied with dietary level of intact glucosinolates, the effects was related more to total intact glucosinolates than to specific glucosinolates, such as progoitrin. MARCH et al, (1978) observed haemorrhage lesions not only in liver but also in other tissue of the birds fed rapeseed meal and suggested the presence of an agent affecting the integrity of the vascular system. et al, (1980) observed that the inclusion of 10% rapeseed meal in broiler diets did not cause severe liver haemorrhage, however, it did produce a significant enlargement of liver; and changes of plasma enzyme activities indicative of damage to the bilary system of the chicks.…”

Section: Effects Of Glucosinolates On Liver In Poultrymentioning

confidence: 90%

Possibilities and limitations of feeding rapesseed meal to broiler chicks

Zeb¹

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The meal left after the extraction of oil has a protein content of up to 50%. Its use is however complicated by several anti-nutrients, the most prominent of them being the glucosinolates. These are sulphur rich compounds found in all members of the cruciferae family. Their hydrolysis products hamper the normal functioning of thyroid gland, resulting among other effects, in decreased levels of thyroid hormones production. These hormones are required to control the normal running of metabolism.According to BELL, (1984) rapeseed would have been the most unlikely plant to be used for food supply, if its toxic factors were known before. It is to the credit of Canadian researchers in this field that the first low erucic acid variety was developed in 1968 and the first double low variety was released in 1974. The terms "double low" or "double zero" refer to low levels of erucic acid and glucosinolates. Some of the varieties are even called triple zero due to further improvement through reducing the fibre content (PUSZTAI, 1989) The name canola was adopted for the double low varieties of rapeseed in 1979. By definition Canola seeds contain less than 2% erucic acid and less than 30 µmoles glucosinolates in its defatted meal. Although the United States Department of Food and Drug Administration recognised Canola as a separate species, in the scientific writings the names canola and double low or double zero-rapeseed are used interchangeably.Although genetic manipulations have introduced much changes in the chemical composition of rapeseed through reduction in erucic acid and glucosinolates, these antinutrients have not yet been totally removed. These are, also, not the only factors detracting from the nutritional worth of rapeseed. The carbohydrates in the meal, which are mostly pectins, cellulose and amyloids, are not regarded as readily digestible, leading to low metabolizable energy content. Phytates present in the rapeseed meal cause the binding of divalent minerals and some proteins. The phenolic compounds have their own effects, the most prominent and thoroughly investigated being the egg taint or the fishy odour in the eggs of brown-shelled-egg-layers.Reduction in the glucosinolate content in rapeseed through quality breeding and other techniques has been limited only to alkenyl-glucosinolates. Almost half of the remaining glucosinolates in the double improved varieties are the indolyl glucosinolates. Seen from a purely genetic point of view, it would not, theoretically, be possible to bring the glucosinolate content in rapeseed meal to zero. This means they will continue to pose problems if other methods could not be devised to remove them from the rapeseed meal.Situation in Pakistan in this regards is different. Bulk of the rapeseed and hence of rapeseed meal is that of high glucosinolate-varieties. And we will have to wait for quite a long time till the meal of the Canola type rapeseed varieties is available in some mentionable quantities.A possible alternative to the breeding approach can be a technological ...

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Low Erucic Acid, Low Glucosinolate Rapeseed Meal, with and without Added Gums in the Layer Diet

Cited by 5 publications

References 14 publications

Dietary Limestone Versus Extra-Dietary Oyster Shell as Calcium Supplements to Different Layer Diets

Dietary Limestone Versus Extra-Dietary Oyster Shell as Calcium Supplements to Different Layer Diets

Performance of Laying Hens Fed Diets Containing Soybean Gums, Rapeseed Gums or Rapeseed Meals With and Without Gums

Possibilities and limitations of feeding rapesseed meal to broiler chicks

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