Effect of Heat Stress Alleviating Agents on Performance of Broilers
Loading...
Date
2016
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MAFSU, Nagpur
Abstract
The study was conducted to evaluate the “effect of certain heat
stress alleviating agents on performance of broilers.” The experiment was
conducted at Poultry Research Centre, Post Graduate Institute of Veterinary and
Animal Sciences, Akola from 7 May to 18th June 2016 with an objective to study
the study the effect of dietary supplementation of vitamin C, chromium picolinate and magnesium sulphate on growth performance and economics of broiler
production.
Three hundred Cobb 400 day-old broiler chicks were equally and randomly
distributed into five treatment groups which subdivided three replicates containing
20 chicks in each, reared on deep litter system in pens upto 6 weeks of age. The
diets were formulated as per BIS, 2007. The dietary treatment groups were the
control diet Control – Basal diet (A), Basal diet + Vitamin C @ 250 mg/ kg diet (B),
Basal diet + Chromium picolinate @ 2.5 mg/kg diet (C), Basal diet + Magnesium
sulphate @ 2.5 g/kg diet (D) Basal diet + Vitamin C @ 250 mg/ kg diet +
Chromium picolinate @ 2.5 mg/kg diet + Magnesium sulphate @ 2.5 g/kg diet (E).
All the diets were maintained isocaloric and isonitrogeneous, with uniform
managemental practices to all the groups.
Results regarding growth performance viz., body weight, weight gain,
feed intake and feed efficiency were obtained weekly upto the 6th week age. Blood
biochemical changes viz. total protein, albumin, cholesterol and ALP was
observed. Heterophil/lymphocyte ratio was also recorded. Dressing percentage
and cut of parts was recorded at the end of experiment. The average initial live
body weight of chicks were 37.90 ± 0.01, 37.96 ± 0.14, 37.93± 0.10, 35.26 ± 0.4,
and 34.33 ± 0.23 g,for treatment groups A,B,C,D and E respectively. The average
body weights in different treatment groups were 1578.47±32.79, 1824.78±23.97,
1885.18±30.84, 1797.60±28.63 and 1893.92±26.63g, at the 6th week of age in A,
B, C, D, and E groups respectively. The cumulative feed consumption observed in
the respective treatment groups were 2949.66±98.91, 3370.40±154.54,
3363.67±201.22, 3417.22±212.04 and 3404.16±30.84 g and average cumulative
feed efficiency were 1.92±0.05, 1.88±0.06, 1.82±0.03, 1.94±0.04 and 1.83±0.01 in
A, B, C, D and E groups at 6th week of age respectively. The birds fed all the heat
alleviating agents had shown significantly higher body weights and weight gain
than control. Among the treated groups combination of vit C, chromium picolinate
and magnesium sulphate i.e. E group and Chromium picolinate had shown higher
body weight. Feed intake and feed efficiency were found to be improved in
combination or alone heat alleviating nutritional agents.
The overall mortality during whole experimental period upto 6th week of age
was 24% in control followed by 10% in Mgso4, 3% in vit. C and 3% in Chromium Picolinate. It was mainly due to heat stress as the summer temperature
ranged during the experimental period was 42-460C
Blood biochemical changes significantly decrease in total protein, albumin
and glucose however significantly increase in serum cholesterol and ALP at the six
week of age in control group. Higher IBD antibody titter was found in chromium
picolinate alone and in combination group. Significantly higher RD titters was
observed in combination group. Significantly increase in heterophil lymphocyte
ratio in heat stress birds however, significantly lower in heat stress alleviating
agents.
Differences in dressing percentage, eviscerated yield and cut of parts of
broilers in all the treatment groups were found to be non-significant.
Economically, Chromium picolinate and combination of Chromium
Picolinate, Vit. C and MgSo4 groups have given higher profit as compare to other
experimental and control groups.
So it can be conclude that, supplementation of Chromium picolinate alone or
combination of nutritional agents during heat stress bird showed better
performance in terms of higher body weight, weight gain and better feed
conversion ratio when compared to control group. More ever chromium picolinate
supplemented groups showed higher net profit than other groups.
Description
Keywords
null