Effect of Rearing Diet on Performance of Early Maturing Pullets

Leeson, S.; Summers, J. D.

doi:10.4141/cjas81-089

Cited by 27 publications

(26 citation statements)

References 1 publication

(2 reference statements)

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“…The growing pullet seems adept at controlling its energy intake, and this is confirmed by the comparable energy intake pattern observed with birds offered a choice of diets in the split-diet program. These data confirm the observations of Leeson and Summers (1981) that suggest that the limiting factor in controlling pullet growth rate is the bird's voluntary limit to energy intake. Similarly, Wolf et al (1969) previously indicated that dietary energy and protein level have little effect on energy intake, and that diet volume was the only factor significantly influencing energy consumption up to maturity.…”

Section: *^supporting

confidence: 91%

Use of Single-Stage Low Protein Diets for Growing Leghorn Pullets

Leeson

Summers

1982

Poultry Science

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Two experiments were conducted in which growing White Leghorn pullets were fed single-stage 14% CP diets from 0 to 19 weeks. In the first trial, diet treatments were 1) conventional step-down protein, 2) reverse-protein, 3) 14% CP single-stage with methionine and lysine adjusted to 2 and 5% of CP, respectively, 4) as per 3 to 12 weeks followed by 14% CP with no amino acid constraints to 19 weeks. Each treatment was tested with 14 replicated cages each of 11 commercial strain Leghorn pullets. Single-stage 14% CP diets reduced pullet weight to 16 weeks relative to conventionalLy fed birds, although after this time no significant (P greater than .05) effect was observed. Pullets fed the reverse-protein diets were significantly (P less than .01) smaller than birds from all other treatments. During a subsequent 52-week laying period, rearing treatment had no significant effect on egg production, egg weight, shell deformation, feed intake, or Haugh units. A second trial was conducted to note the effect of energy level on the birds' response to low-protein diets. Diets of 14.4% CP were formulated to provide either 2610 or 3164-kcal ME/kg. A third treatment allowed for self-selection of two diets providing concentrated sources fo protein or energy. Each treatment was tested with nine replicate cages of 10 commercial strain White Leghorn pullets. Dietary energy had little effect on pullet development. Although birds offered the low-energy diets consistently consumed more protein, diet had no effect on body weight or carcass composition at 18 weeks. The data indicate that single-stage low-protein diets are suitable for growing pullets to maturity. Compared to a conventional step-down protein program, the single-stage 14% CP diet does not control body weight but does give comparable laying performance, albeit at reduced protein intake during rearing. The simplicity of the program is discussed relative to industry needs.

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Section: *^supporting

confidence: 91%

Use of Single-Stage Low Protein Diets for Growing Leghorn Pullets

Leeson

Summers

1982

Poultry Science

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“…As previously reported by Leeson and Summers (1981), high-energy rearing diets result in reduced energy consumption. In this study the higher energy corn-soybean meal diet resulted in reduced energy intake, particularly during the 6-to 1S-wk period.…”

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confidence: 52%

Early Reproductive Characteristics of Leghorn Pullets Reared on Least-Cost Diets Formulated to Protein and/or Amino Acid Specifications

Leeson¹,

Summers²

1985

Can. J. Anim. Sci.

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Lsesox, S. eNo Suvvrens, J. D. 1985. Early reproductive characteristics of Leghorn pullets reared on least-cost diets formulated to protein and/or amino acid specifications. Can. J. Anim. Leghorn pullets were reared on one of four dietary programs formulated to (l) conventional least-cost, (2) least-cost to amino acid requirements with no specification for crude protein, (3) as (2) with cost of protein feedstuffs increased 40Vo and (4) corn-soybean meal. All diets contained lSVa and l5%o CP, or equivalents, for 0-6 and 6-18 wk, respectively. Diets were offered ad-libitum to 14

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“…This genetically distinct light weight group responded differently to dietary nutrients relative to that seen with unsegregated flocks. From observation with unsegregated birds, it was originally proposed that energy intake would be maximized with a lower energy diet (Cunningham and Morrison, 1976;Leeson and Summers, 1981), and hence, the use here of a low energy diet to attempt to stimulate the light-weight pullets. However, this diet depressed energy intake of these pullets (Tables 3, 5, and 7).…”

Section: Resultsmentioning

confidence: 99%

“…From work with unsegregated flocks, energy intake is maximized through use of low rather than high energy diets (Cunningham and Morrison, 1976;Leeson and Summers, 1981), while there appears to be a positive correlation between dietary protein content and growth (Leeson and Summers, 1982).…”

Section: Introductionmentioning

confidence: 96%

Influence of Nutrient Density on Growth and Carcass Composition of Weight-Segregated Leghorn Pullets

Leeson

Summers

1984

Poultry Science

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Leghorn pullets were weight-segregated at either 8, 12, or 16 weeks of age and classified as either light, medium, or heavy weight. Six replicate cages each containing 10 birds of each of the three weight groups received a control diet ad libitum that contained 15% CP and provided 2800 kcal ME/kg. The same replicate number of light-weight pullets were also offered either high protein (18% CP, 2800 kcal ME/kg) or low energy (15% CP, 2400 kcal ME/kg) diets. Groups of heavy pullets received either low protein (12% CP, 2810 kcal/kg) or high energy (15% CP, 3200 kcal/kg) diets. Feed intake and body weight were recorded at 12, 16, and 19 weeks of age. At 19 weeks of age, 12 birds per treatment were sacrificed for carcass analysis.Diet modification had no beneficial effect on stimulating the growth rate of light pullets regardless of age. High protein diets increased protein intake of the light pullets (P<.05), although this was not related to growth or carcass composition. Feeding light pullets a low energy diet resulted in reduced energy intake (P<.05), contrary to the situation previously reported with unsegregated pullets. Feeding a high energy diet to the heavy pullets resulted in increased energy intake (P<.05) with no moderating effect on growth rate. Growth rate of the heavy pullets was tempered through use of low protein diets introduced at 8 or 16 weeks of age. Feeding the high energy diet to heavy pullets resulted in a consistent trend for increased carcass fat content. A possible explanation for these results is that genotype is largely responsible for early differences in body weight. (

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Effect of Rearing Diet on Performance of Early Maturing Pullets

Cited by 27 publications

References 1 publication

Use of Single-Stage Low Protein Diets for Growing Leghorn Pullets

Use of Single-Stage Low Protein Diets for Growing Leghorn Pullets

Early Reproductive Characteristics of Leghorn Pullets Reared on Least-Cost Diets Formulated to Protein and/or Amino Acid Specifications

Influence of Nutrient Density on Growth and Carcass Composition of Weight-Segregated Leghorn Pullets

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