A quantitative analysis of the literature concerning the restricted feeding of growing pullets

Abstract

The sexual maturity of growing pullets can be retarded either by restricting calorie intake or by feeding a diet deficient in one or more essential amino acids, Several methods have been proposed for achieving either of these objectives. In this review the methods have been classified as (a) limiting the birds' time of access to food, (b) quantitative food restriction, (c) the use of low energy diets and (d) dietary protein restriction.Food restriction by limiting the time of access to food has given inconsistent results and is an unsatisfactory technique. Birds quickly learn to eat normal quantities of food in a very short space of time.Quantitative food restriction has been widely used in experiments and is usually applied from about 6 to about 20 weeks of age. The available evidence enables relationships to be established between the degree of food restriction and subsequent body weight and sexual maturity. The effect of rearing treatment on mortality and rate of lay is also examined.The ad libitum feeding of a low-energy growing diet has always resulted in greater rearing food costs. This is because moderate reductions in energy content of the diet are offset by higher food intake. Diets sufficiently low in energy to cause a reduction in calorie intake will involve the purchase and handling of very large proportions of non-nutritive material.The use of protein-deficient diets during the growing period, or from one day of age, offers a suitable means of delaying sexual maturity. The effects of such a treatment are apparently very similar to those of restricted feeding, but there is a lack of suitable comparisons of the alternative methods.

Growth Performance of Kasila Broiler Parent Stock Reared on Quantitative Feed Restriction under Bangladesh Condition

“…During this time, the chicks were affected by coccidiosis. Strain et al (1965) and Lee et al (1971) also observed that restricted birds were more prone to coccidiosis during their early period of life.…”

Performance Of Growing Male Pigs Exposed To Quantitative Feed Restriction

“…Lee et al (1971) also indicated that birds subjected to feed restriction made higher profit than the control. From the present study pigs fed 7.5%, and 5.5% of their body weight compared favourably tot hat fed the recommended 10% body weight.…”

“…Quantitative and qualitative feed Restriction for Monogastrics have been studied by Bows et al, (1988) who reported on the nature and levels of feed restriction that will not result in considerable weight loss and poor production. Food restriction and compensatory growth are an important phenomenon in temperate condition with food shortage in inter and re-alimentation in wt and dry seasons (Lee et al, 1971;Hogg, 1991). Conversely, in and semi-and areas food shortage occurs in dry season associated with thermal stress.…”

Exigência de lisina para aves de reposição de 0 a 6 semanas de idade

“…Embora exista indicação de melhor desempenho de matrizes pesadas sujeitas à restrição de lisina durante o crescimento (COUCH et al, 1967), os resultados obtidos com poedeiras comerciais na fase de 0 a 6 semanas de idade têm contrariado esta observação, em virtude do aumento do canibalismo (LEE et al, 1971) e da queda permanente da produção e peso dos ovos (CONNOR et al, 1977).…”