Selection of an adequate protein-carbohydrate ratio by the domestic chick

Kaufman, Lynn W.; Collier, George; Squibb, Robert L.

doi:10.1016/0031-9384(78)90229-9

Cited by 41 publications

(9 citation statements)

References 26 publications

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“…Borrowing the adult macronutrient-selection procedure, our laboratory obtained evidence that growing chicks, like adults, could construct a nutritionally adequate diet from individual dietary components (Hayne, Rovee-Collier, & Gargano, 1986;Kaufman, Collier, & Squibb, 1978;Rovee-Collier, Clapp, & Collier, 1982). In the initial study using this paradigm, for example, we offered 10-dayold chicks a simultaneous choice between separate sources of different fractions of macronutrients (protein and carbohydrate) and found that chicks could select a protein-carbohydrate ratio that supported growth at the rate of nonselecting controls (Kaufman et al 1978). In subsequent studies, we found that even younger chicks could systematically alter their relative intakes of the same protein and carbohydrate fractions in a way that yielded optimal growth in different ambient temperatures (Hayne et al, 1986;Rovee-Collier, Collier, Egert, & Jackson, 1993) and when the protein and carbohydrate fractions were successively accessible only at certain portions of the photoperiod (Rovee- Collier et al, 1982).…”

Section: Rovee-collier Et Almentioning

confidence: 99%

Diet selection by chicks

et al. 1996

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Section: Rovee-collier Et Almentioning

confidence: 99%

Diet selection by chicks

et al. 1996

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“…A considerable number of cafeteria-type studies have been conducted in the last century. Most of them reported that chickens were able to self-select nutrients in proportions adequate to sustain normal or near normal growth (Kaufman et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Effect of free-choice feeding on the performance and ileal digestibility of nutrients in broilers

Cruz

Pezzato

Pinheiro

et al. 2005

Rev. Bras. Cienc. Avic.

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An experiment was conducted to study ileal digestibility of nutrients and to verify the ability of broilers to select feed in order to meet their requirements for protein and energy. The treatments consisted of six diets: R+S: free-choice feeding with rice bran (energy) and soybean meal (protein); C+G: free-choice feeding with corn (energy) and corn gluten meal (protein); R+G: free-choice feeding with rice bran (energy) and corn gluten meal (protein); C+S: free-choice feeding with corn (energy) and soybean meal (protein); R+C+G+S: free-choice feeding with rice bran and corn (energy) and corn gluten meal and soybean meal (protein); and BD: basal diet represented by a complete diet composed of 63% corn and 33% soybean meal. The results indicated that the adjustment to nutritional requirements does not depend only on the ability of birds to select feed. It might also depend on intake and ingredient quality, since some ingredients did not provide a balanced amount of nutrients. The birds were able to fulfill their requirements for maintenance, that is, they consumed the minimum amount of amino acids (g per day) for maximum growth. The free-choice group with corn gluten meal as the protein source had the worst performance, which indicated that this feed is not recommended as a primary source of amino acids for broilers. The C+G diet presented the highest digestibility coefficient of dry matter and crude protein, whereas the C+S diet resulted in the highest digestibility coefficient of ether extract and nitrogen-free extract, indicating that diet digestibility was affected by the type of feed used as energy and protein sources. In general, the high digestibility values indicate that broilers are able to efficiently digest and absorb the supplied feed

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“…Chicks can select the required dietary needs in a choice situation when offered different meal diets with differing protein levels (Hughes, 1984; Kaufman, Collier & Squibb, 1978; Gous & Swatson, 2000; Hale & Green, 1988). In the natural situation IF is part of a variety of food types consumed by this highly omnivorous species (Collias & Collias, 1967; Savory, 1989; Klasing, 2005).…”

Section: Discussionmentioning

confidence: 99%

Chicks change their pecking behaviour towards stationary and mobile food sources over the first 12 weeks of life: improvement and discontinuities

Murphy

Hayden

Kent³

2014

PeerJ

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Chicks (Gallus gallus domesticus) learn to peck soon after hatching and then peck in rapid bursts or bouts with intervals of non-pecking activity. The food sources may be static such as seeds and chick crumb, or mobile such as a mealworm. Here, changes with age in pecking toward chick crumb and a mealworm were measured.Chicks were reared in pairs and their pecking of crumb food was video recorded in their pair housed environment, from food presentation, every third day from day 8 (wk 2) to day 65 (wk 10). Peck rate at crumb food reached maximum levels at day 32 (wk 5), and then declined, fitting a quadratic model, with no sex, sex of cagemate, or box order effects. Within bouts the peck rate was higher and it increased to day 41 (wk 6) and then declined, and here males pecked faster than females. A change in dietary protein concentration from 22% to 18% at day 28 (wk 4) had no effect on subsequent peck rate.Pecking at and consumption of a mealworm in pair housed chicks were measured weekly from wks [5 to 12]. The latency to first worm peck and latency to swallow decreased to wk 8 and increased thereafter. The peck rate to first wormpeck and number of pecks to swallow increased to wk 8 and then declined paralleling the changes with crumb food. The increase in peck rate is coupled with an increase in efficiency in worm catching.The results are consistent with the view that the improvement in pecking ability and accuracy compliments change in nutritional requirement best served by an invertebrate food (IF) source requiring speed to achieve feeding success, especially with live prey. When this food source is no longer crucial these associated skill levels decline. An appreciation of the role of domestic fowl in controlling insect populations, at farm level, that are often vectors in disease spread is lacking.

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Selection of an adequate protein-carbohydrate ratio by the domestic chick

Cited by 41 publications

References 26 publications

Diet selection by chicks

Diet selection by chicks

Effect of free-choice feeding on the performance and ileal digestibility of nutrients in broilers

Chicks change their pecking behaviour towards stationary and mobile food sources over the first 12 weeks of life: improvement and discontinuities

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