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Titolo:
Effect of photoperiod and quantitative feed restriction in a broiler strain on onset of lay in females and onset of semen production in males: A genetic hypothesis
Autore:
Eitan, Y; Soller, M;
Indirizzi:
Hebrew Univ Jerusalem, Alexander Silberman Inst Life Sci, Dept Genet, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel
Titolo Testata:
POULTRY SCIENCE
fascicolo: 10, volume: 80, anno: 2001,
pagine: 1397 - 1405
SICI:
0032-5791(200110)80:10<1397:EOPAQF>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
THRESHOLD BODY-WEIGHT; SEXUAL MATURITY; FIRST EGG; REPRODUCTIVE FUNCTION; OVARIAN MORPHOLOGY; 2-WAY SELECTION; BREEDER HENS; AD-LIBITUM; 1ST EGG; AGE;
Keywords:
broiler; photoperiod; feed restriction; sexual maturity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Soller, M Hebrew Univ Jerusalem, Alexander Silberman Inst Life Sci, Dept Genet, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 usalem, Israel
Citazione:
Y. Eitan e M. Soller, "Effect of photoperiod and quantitative feed restriction in a broiler strain on onset of lay in females and onset of semen production in males: A genetic hypothesis", POULTRY SCI, 80(10), 2001, pp. 1397-1405

Abstract

The effects of feed restriction and photoperiod on body weight (WTSXM) andage (ASXM) at onset of mature semen production in males and onset of lay in females of a broiler female line were examined. Feeding treatments were as follows: ad libitum (AL) and quantitative feed restriction (QR). Photoperiod treatments were as follows: open shed (OS), in which the chicks were reared under naturally increasing daylight with supplemental light; dark room(DR), in which chicks were reared under short days, gradually increasing from 6 h of light (L) to 11.5L; and dark room to open shed (DR-OS), in whichchicks reared under short days in the dark room were transferred to the open shed at 149 d. Treatment effects were similar in direction in males and females, suggesting similar control of entry into reproduction of the two sexes, although within a given treatment, males matured earlier than females. Effects of feeding and photoperiod treatments were additive. Relative to QR, the AL feeding treatment increased WTSXM by 832 g for males and 1,089 gfor females; ASXM was decreased by 15.8 d for males and 9.3 d for females. Relative to OS, the DR photoperiod increased WTSXM by 391 g for males and 513 g for females; ASW was increased by 17.5 d for males and 26.8 d for females. The DR-OS photoperiod increased WTSXM by 86 and 169 g for males and females, respectively; ASXM was increased by 6.1 d and 4.9 d, respectively. Under DR, the delay in onset of sexual maturity caused by QR was not due tofailure to reach threshold body weight or age and, hence, appears to have resulted from the feed restriction itself. A similar delay for QR was foundunder OS but might have been due to failure to reach threshold body weight. It is speculated that the delay in onset of sexual maturity caused by feed restriction may be an ecological adaptation or, alternatively, a result of nutritional imbalance.

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Documento generato il 05/12/20 alle ore 01:08:32