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פותח על ידי קלירמאש פתרונות בע"מ -
Attempts to achieve low-weight broiler breeder hens by severe growth depression during various periods up to 6 weeks of age and food allocation below the recommendations thereafter
Year:
1994
Source of publication :
British Poultry Science
Authors :
ברטוב, עדו
;
.
וקס, אליהו
;
.
Volume :
35
Co-Authors:
Bartov, I., Department of Poultry Science, Agricultural Research Organization, The Volcani Center. FOB 6, Bet Dagan 50250, Israel, Egg & Poultry Board, POB 7133, Tel Aviv, Israel
Wax, E., Department of Poultry Science, Agricultural Research Organization, The Volcani Center. FOB 6, Bet Dagan 50250, Israel
Facilitators :
From page:
573
To page:
584
(
Total pages:
12
)
Abstract:
1. Three experiments were carried out with White Rock (Anak) female chicks to evaluate the possibility of obtaining low-weight breeder hens and to assess their reproduction potential. Such hens were obtained by early growth depression induced by either severe food restriction (SFR) from 1 or 2 to 3 or 4 weeks of age, or a low-protein diet (LPD) fed from 0 to 6 weeks of age, or the use of diets containing 0-7 or 0-8% zinc as ZnO from 1 to 3 weeks of age, followed by food allocation below recommendation up to 22 or 67 weeks of age. 2. Body weights (BW) of the birds whose growth had been depressed were consistently and at time significantly lower than those of the control birds throughout the experiments. Age at first egg was delayed in hens previously fed the LPD and the diet containing the higher concentration of ZnO, and in those exposed to SFR from 2 to 4 weeks of age. BW at that time tended to be lower in birds whose growth had been depressed, although a significant effect was observed in only one experiment. 3. Egg production and egg size were not significantly affected by the various treatments, except for the lower production in hens fed the LPD at an early age. 4. Negative regressions (on an individual basis) were consistently observed between BW at 22 weeks of age and age at first egg, and between age at first egg and number of eggs laid. Positive regressions were observed between age at first egg and BW at that time. The regressions between BW at 22 weeks of age and number of eggs laid were positive but not always significant. 5. Severe growth depression at an early age (produced by food restriction or ZnO supplemented diet, but not LPD) followed by decreased allocation of food afterwards, could provide a means for reducing BW of broiler breeder hens without adversely affecting egg production. This procedure may save 2-5 to 6-6% of the food consumed during the life span of the birds. © 1994, Taylor & Francis Group, LLC. All rights reserved.
Note:
Related Files :
aging
analysis of variance
Animal
animal food
Chickens
Female
low calory diet
regression analysis
Reproduction
עוד תגיות
תוכן קשור
More details
DOI :
10.1080/00071669408417722
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20617
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:37
Scientific Publication
Attempts to achieve low-weight broiler breeder hens by severe growth depression during various periods up to 6 weeks of age and food allocation below the recommendations thereafter
35
Bartov, I., Department of Poultry Science, Agricultural Research Organization, The Volcani Center. FOB 6, Bet Dagan 50250, Israel, Egg & Poultry Board, POB 7133, Tel Aviv, Israel
Wax, E., Department of Poultry Science, Agricultural Research Organization, The Volcani Center. FOB 6, Bet Dagan 50250, Israel
Attempts to achieve low-weight broiler breeder hens by severe growth depression during various periods up to 6 weeks of age and food allocation below the recommendations thereafter
1. Three experiments were carried out with White Rock (Anak) female chicks to evaluate the possibility of obtaining low-weight breeder hens and to assess their reproduction potential. Such hens were obtained by early growth depression induced by either severe food restriction (SFR) from 1 or 2 to 3 or 4 weeks of age, or a low-protein diet (LPD) fed from 0 to 6 weeks of age, or the use of diets containing 0-7 or 0-8% zinc as ZnO from 1 to 3 weeks of age, followed by food allocation below recommendation up to 22 or 67 weeks of age. 2. Body weights (BW) of the birds whose growth had been depressed were consistently and at time significantly lower than those of the control birds throughout the experiments. Age at first egg was delayed in hens previously fed the LPD and the diet containing the higher concentration of ZnO, and in those exposed to SFR from 2 to 4 weeks of age. BW at that time tended to be lower in birds whose growth had been depressed, although a significant effect was observed in only one experiment. 3. Egg production and egg size were not significantly affected by the various treatments, except for the lower production in hens fed the LPD at an early age. 4. Negative regressions (on an individual basis) were consistently observed between BW at 22 weeks of age and age at first egg, and between age at first egg and number of eggs laid. Positive regressions were observed between age at first egg and BW at that time. The regressions between BW at 22 weeks of age and number of eggs laid were positive but not always significant. 5. Severe growth depression at an early age (produced by food restriction or ZnO supplemented diet, but not LPD) followed by decreased allocation of food afterwards, could provide a means for reducing BW of broiler breeder hens without adversely affecting egg production. This procedure may save 2-5 to 6-6% of the food consumed during the life span of the birds. © 1994, Taylor & Francis Group, LLC. All rights reserved.
Scientific Publication
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