The effect of alternative feeding strategies for broiler breeders (World Poultry Congress)
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Transcript of The effect of alternative feeding strategies for broiler breeders (World Poultry Congress)
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The effects of alternative feeding strategies for broiler breeders
Arrazola A., Mosco E., Widowski T.M., Guerin M.T. and Torrey S.
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Commercial feed restriction programsHunger
Frustration Lack of satiety
F&O Pecking Overdrinking
Feed restriction
Feed allotment
Feeding rate
Competition
BW uniformity
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Feeding strategies to increase feed intake
Reduce feed quality Addition of fiber sources Appetite suppressants
Intermittent feeding frequencies Skip-a-day (SAD) 4/3 5/2 Graduated 36 pullets at week 12
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Objective
The objective of this research was to examine the effect of a rationed alternative diet and
non-daily feeding schedules for broiler breeders under simulated commercial
conditions
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Methodology: housing and experimental design
1,680 Ross 308 females 70 pullets/pen (7.7 birds/m2) 4 isocaloric dietary treatments From 3 to 22 weeks Feeder space: 4 cm/pullet
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Dietary treatments
1-5% Appetite suppresant + 40% Fiber
1. Control diet, daily
3. Control diet, 4/3
4. Control diet, graduated
2. Alternative diet, daily
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Data collection
Growth rate and body weight uniformity
• Random subsample of 25 pullets/pen• Week: 3, 6, 10, 14 and 17
At week 23:
• All birds were weighed• Maturity score
Aviagen, 2013
mature immature
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Data collection
Foot lesion and hock burn prevalence
• Same subsample of birds• Biweekly• Yes/no score
Welfare Quality, 2014
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Data collection and statistical analysis
Litter moisture
• Weekly sampling• 4 subsamples per pen• Dehydrated for 24h at 60º C
SAS version 9.4Glimmix procedure• Pen, room as random effect • Week as repeated measure• Initial as covariate (CV and litter moisture)
Statistics analysis
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Results and discussion: growth rate
Treatment x week*
4/3
5/2
Daily
5/2
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Results and discussion: flock uniformity
4/3 5/2 Daily
x 100
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Results and discussion: maturity score at week 23
BWimmature= 1913 g
a a ab b a>b (P < 0.05)
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Results and discussion: litter moisture
Treatment x week*
Heaterson
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Results and discussion: foot lesions
Treatment x week*
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Conclusion
Fixed 4/3 schedule resulted in lighter and lower percentage of mature birds at the end of the rearing period
Difference in body weight for the graduated treatment was no longer significant after switching to a daily feeding basis at
week 19
Non-daily feeding programs and qualitative restriction did not improve body weight uniformity during rearing phase
Alternative diet increased litter moisture and prevalence of foot lesions during the first few weeks of rearing
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Further data from rearing
Additional measurements during rearing:
Behaviour recordings Blood sampling:
Plasma corticosterone Plasma glucose Heterophil / lymphocyte ratio Basophil count
Feather coverage Feather information:
Growth
Fault bars/stress bands
Feed intake test
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Next steps:
The long-term effect of rearing conditions during laying
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Acknowledgements
Volunteers & StudentsElyse Mosco
Iran Oliveira Da SilvaAra Khanamtran Candace MartinsGeisa Mainardes
Hillary DaltonJacqueline Chow
Jessica Ellis Katherine Hobson
Lilia SerpaMarcos Donizete Silva
Marissa Belanco Meagan Coffey Melissa SpeirsMischa Ross
Michelle LopesNatalia Stefanoska
Nicole Bermingham Patrick Birkl
Peter McBrideVinicious Machado dos
Santos
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Diet formulations
+40% extra S+50% extra G1+54% extra G2
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Reliability
Scores Kappa coefficient Percentage of agreement
Maturity 94.4% 98.6%
Foot lession 79.1% 98.2%
Hock burn 48.7% 96.5%
Feather coverage 71,2% 77.2%