Effects of Photoperiods during the Laying Period on Broiler Breeder Performance
الموضوعات :
ت. مکرمی
1
(Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran)
ن. هدایت ایوریق
2
(Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran)
ب. نویدشاد
3
(Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran)
الکلمات المفتاحية: Performance, hatchability, egg production parameters, laying broiler breeders, photoperiods,
ملخص المقالة :
The effects of increasing the laying period day-length from 13 to 16 hours were examined in Ross (308) broiler breeders. The birds reared on 8-h photoperiods and then were photo-stimulated at 21 weeks by increasing the photoperiods from 8 h of light, 16 h of darkness (8L:16D) to 11L:13D. Then the birds were given an additional 60 min of light per week cumulatively, such that in different experimental groups the 12L:12D, 13L:11D, 14L:10D, 15L:9D and 16L:8D photoperiods were achieved in 22, 23, 24, 25 and 26 weeks of age, respectively. The photoperiods remained unchanged until the experiment was finished at 50 weeks of age. The 16L:8D group had a poorer feed conversion and less egg production and egg mass than the other 3 groups (P<0.05). The total settable egg percentage was significantly lower for 15L:9D and 16L:8D than for 13L:11D and 14L:10D birds (P<0.05). The 13L:11D and 14L:10D h hens had more double-yolked and broken or abnormal eggs, followed by the 15L:9D h birds, and the 16L h birds (P<0.05). The mean egg weight of 14L:10D birds was significantly more than for 16-L h birds (P<0.05), with 13L:11D and 14L:10D birds were intermediated (P<0.05). The percentage of hatchability was higher in 13L:11D h hens followed by the 15L:9D and the 16L:8D birds (P<0.05), with 14L:10D h hens intermediated between 13L:11D and 15L:9D groups. The findings of this study suggest that 13L:11D was the optimal photoperiods for Ross 308 broiler breeders in the laying period up to 50 weeks of age.
Aviagen. (2016). Ross Broiler Management Manual. Aviagen Incorporated, Huntsville, Alabama, USA.
Ciacciariello M. and Gous R.M. (2005). To what extent can the age at sexual maturity of broiler breeders be reduced? South Africa J. Anim. Sci. 35, 73-82.
Cobb. (2016). Cobb Breeder Management Guide. WebMD. www.cobb-vantress.com/docs/. Accessed Jan. 2018.
Dawson A. (2001). The effects of a single long photoperiod on induction and dissipation of reproductive photorefractoriness in European starlings. Gen. Comp. Endocrinol. 121, 316-324.
Hocking P.M. (1993). Effects of body weight at sexual maturity and the degree and age of restriction during rearing on the ovarian follicular hierarchy of broiler breeder females. Br. Poult. Sci. 34, 793-801.
Joseph N.S., Dulaney A.A.J., Robinson F.E., Renema R.A. and Zuidhof M.J. (2002). The effects of age at photostimulation and dietary protein intake on reproductive efficiency in three strains of broiler breeders varying in breast yield. Poult. Sci. 81, 597-607.
Lewis P.D., Perry G.C. and Morris T.R. (1994). Effect of breed, age and body weight at sexual maturity on egg weight. Br. Poult. Sci. 35, 181-182.
Lewis P.D., Perry G.C. and Morris T.R. (1997). Effect of size and timing of photoperiod increase on age at first egg and subsequent performance of two breeds of laying hen. Br. Poult. Sci. 38, 142-150.
Lewis P.D., Ciacciariello M. and Gous R.M. (2003). Photorefractoriness in broiler breeders: sexual maturity and egg production evidence. Br. Poult. Sci. 44, 634-642.
Lewis P.D. and Backhouse Gous R.M. (2004). Photoperiod and oviposition time in broiler breeders. Br. Poult. Sci. 45, 561-564.
Lewis P.D., Backhouse D. and Gous R.M. (2005). Effects of constant photoperiods on the laying performance of broiler breeders allowed conventional or accelerated growth. J. Agric. Sci. 143, 97-108.
Lewis P.D. (2006). A review of lighting for broiler breeders. Br. Poult. Sci. 47, 393-404.
Lewis P.D. and Gous R.M. (2006a). Constant and changing photoperiods in the laying period for broiler breeders allowed normal or accelerated growth during the rearing period. Poult. Sci. 85, 321-325.
Lewis P.D. and Gous R.M. (2006b). Effect of final photoperiod and twenty-week body weight on sexual maturity and egg production in broiler breeders. Poult. Sci. 85, 377-383.
Lewis P.D., Gous R.M., Ghebremariam W.K. and Sharp P.J. (2007). Broiler breeders do not respond positively to photoperiodic increments given during the laying period. Br. Poult. Sci. 48, 245-252.
Lewis P.D., Tyler N.C., Gous R.M., Dunn I.C. and Sharp P.J. (2008). Photoperiodic response curves for plasma LH concentrations and age at first egg in female broiler breeders. Anim. Reprod. Sci. 109, 274-286.
Lewis P.D., Danisman R. and Gous R.M. (2010). Photoperiods for broiler breeder females during the laying period. Poult. Sci. 89, 108-114.
MacLeod M.G., Jewitt T.R. and Anderson J.E.M. (1988). Energy expenditure and physical activity in domestic fowl kept on standard and interrupted lighting patterns. Br. Poult. Sci. 29, 231-244.
Robinson F.E., Renema R.A., Bouvier L., Feddes J.J.R., Zuckerman A.I., Wilson J.L., Newcombe M. and Mckay R.I. (1998). Effects of photostimulatory lighting and feed allocation in female broiler breeders. 2. Egg and chick production characteristics. Canadian J. Anim. Sci. 78, 615-623.
SAS Institute. (1994). SAS®/STAT Software, Release 6.10. SAS Institute, Inc., Cary, NC. USA.
Sharp P.J., Dunn I.C. and Cerolini S. (1992). Neuroendocrine control of reduced persistence of egg-laying in domestic hens: Evidence for the development of photorefractoriness. J. Re-prod. Fertil. 94, 221-235.
Tyler N.C. and Gous R.M. (2011). Selection for early response to photostimulation in broiler breeders. Br. Poult. Sci. 52, 517-522.
Ubuka T., Bentley G.E. and Tsutsui K. (2013). Neuroendocrine regulation of gonadotropin secretion in seasonally breeding birds. Front. Neurosci. 7, 38-45.
