Showing papers in "Poultry Science in 1971"

TL;DR: The Subcommittee on Poultry Nutrition of the National Research Council revised its recommended calcium requirement for laying hens in 1962 and a level of 2.75% was adopted, based on the many reports indicating the need for more calcium than the 2.25% previously recommended.

TL;DR: Because young chickens with aflatoxicosis frequently have a pale, enlarged, and friable liver the possibility that dietary aflatoxin can induce the fatty liver syndrome in laying hens was investigated.

TL;DR: The results of experiments in which rye has been used to replace other cereal grains of the diet have usually shown rye to have a very low nutritional value, and the literature on the value of rye has recently been reviewed.

TL;DR: This data indicates that chickens inoculated with a herpesvirus strain were protected from disease when subsequently challenged with a virulent strain of virus and the attenuated virus was effective against MD in field trials.

TL;DR: This laboratory has studied the digestibility of amino acids by measuring the amino acids in the intestine and/or in feces and the interpretation of such results into practical availability figures is difficult.

TL;DR: The use of poultry litter as food has been studied by several investigators as mentioned in this paper, who have shown that satisfactory animal nutrition can be obtained when cattle, chickens, sheep, and swine are fed poultry litter.

TL;DR: A Flatoxicosis in chickens has been characterized mainly by lowered growth rates and inefficient conversion of feed and the possibility of interaction of aflatoxicosis with other diseases has been studied since the disease was discovered.

TL;DR: This work has shown that hairlessness, poor growth and reproductive failure in rats and chicks are prevented with as little as 0.1 mg of dietary selenium per kg.

TL;DR: Social stress has been found to modify the response of chickens to infectious diseases and chemicals which block the production of corticosterone by the adrenals resulted in increased resistance to viral infections and decreased resistance to E. coli infection.

TL;DR: There are several reports in the literature which indicate that dietary alterations have an influence on the severity of aflatoxicosis, and a more economical solution would be the development of a dietary additive or modification that would make the birds more resistant to aflatoxin.

TL;DR: Birds are homeotherms and so are less vulnerable to environmental temperature changes than poikilotherms in respect of both functional efficiency and danger of tissue damage.

TL;DR: No environmental control was used in these studies, and as a result, a large part of the gains observed could have been the result of a positive environmental trend.

TL;DR: Many available protein sources are generally deficient in methionine, lysine, tryptophan and sometimes threonine, and these deficiencies have an adverse effect on the immune response.

TL;DR: The use of batteries or wire floors for growing and fattening birds was documented by Bethke and Kennard (1928), Carver (1931) and Buckner et al. (1933).

TL;DR: This work has shown that cholestyramine had no influence on yolk cholesterol levels, although it significantly reduced the concentrations of plasma cholesterol, thus suggesting the possibility of pronounced cholesterol synthesis in the ovary.

TL;DR: Realized heritabilities of 0.30 (Siegel, 1962) and 0.40 (Jaap, 1963) have been reported for short-term responses to selection for 8-week body weight in chickens, in accord with a summary by Siegel of 176 published heritability estimates of body weights for chickens 6 to 12 weeks of age.

TL;DR: Results show that selection for increased egg production alone resulted in large increases in egg production the first few generations with little loss in body weight, but in later generations, response to selection diminished and a major loss inBody weight occurred.

TL;DR: The authors reported that porcine prerigor salt-soluble proteins produce more stable emulsions than that observed from postrigor proteins, which is a result of the use of prerigors in emulsification.

TL;DR: The sudden occurrence of a high incidence of bruising on two poultry farms in North Carolina and the finding of a flatoxin in the chicken feed used on these farms suggested that aflatoxin might be involved in the hemorrhagic syndrome of chickens.

TL;DR: It is concluded that large amounts of lecithin were synthesized by laying hens and added to this basal diet increased egg production, prevented weight loss, and reduced liver fat.

TL;DR: In the hen, spermatozoa labelled with inorganic 32 P were recovered from the infundibulum within one hour after intravaginal insemination but no literature was found concerning the rapidity of sperm transport.

TL;DR: This paper presents a historical and pathological description of aflatoxicosis in broiler chickens in Western Australia and reports on its symptomology and widespread occurrence in ducks and chickens in South Africa.

TL;DR: A crystalline amino acid diet is used to study the lysine need of growing chicks during the 2nd through the 5th weeks of life and provides an ideal tool for understanding the decline in protein requirement with increasing age.

TL;DR: The purpose of this study was to determine the effects of aging on egg laying, fertility, hatchability and mortality of Japanese quail maintained under normal laboratory conditions.

TL;DR: It would be beneficial to determine if factors under the control of the commercial egg producer could be used to decrease the cholesterol content of eggs on the market.

TL;DR: The basis of selection most often used was full-sib family selection, while progeny testing was employed in some studies, while the criterion of selection was the percentage mortality from all forms of leukosis during the rearing and laying periods.

TL;DR: The earliest detection of plasma glucose in chick embryos has been approximately day 4 of incubation and the values obtained at this stage of development progressively rise until by hatching time they are essentially “adult” levels of 190 mg.%.

TL;DR: Feeding studies on the utilization of poultry litter as a feed additive for ruminants demonstrated satisfactory animal nutrition, and poultry and shell egg producers were provided with a profitable means of litter disposal, and livestock producers were afforded an attractive source of cheap feed.

TL;DR: Results of various gassing levels for the two 4-day periods of 17-20 and 18-21 days respectively involved a fluctuating response to high O2 levels, followed by a decreased resistance, then by a reversal of trend toward a very high resistance in the 13-16 day period.

TL;DR: The cystine need may be affected differently by age than the methionine need, as with increasing age keratin synthesis assumes an increasingly important role in protein synthesis.