Page 7 - National Poultry Newspaper

GAA improves low crude protein diets
A NOVEL nutritional chicken diets, as less • Normal CP diet (CP lower weight gain, higher tive weight of abdominal
strategy to improve feed efficiency and decrease abdominal fat pad in meat chickens fed low crude protein diets was presented in Ideas Ex- change 2021 conference by Dr Nishchal Sharma from the University of New England.
protein meals and more crystalline amino acids are used.
lowered by 215 g/kg in grower and 197 g/kg in finisher)
FCR, lower breast meat yield, lower breast meat creatine concentration and higher abdominal fat pad compared to those offered a normal CP diet.
fat and breast meat pH. There were no further benefits of adding betaine with GA A on the param- eters measured but the results with GA A were consistent in the presence
The presentation high- lighted the role of guani- dinoacetic acid and be- taine in low crude protein diets fed to meat chick- ens.
The project, funded by Poultry Hub Australia and led by Dr Nishchal Sharma at the University of New England, inves- tigated the rate at which GAA can spare Arg with and without betaine in moderately low CP diets. Methodology
• A low CP diets with GA A, where 0.1 percent added l-arginine was spared by GA A at 50 per- cent, 100 percent and 150 percent with and without 0.1 percent betaine.
When GAA spared Arg at 150 percent, growth performance and meat quality parameters be- came comparable to Arg sufficient low CP and normal CP treatments.
diets.
Increased FCR and ab-
Nishchal emphasised that only two thirds of the daily creatine require- ments of birds is synthe- sised endogenously and the rest should be sup- plemented through feed.
A common starter diet was fed for the first 10 days post-hatch.
When GAA spared Arg at 100 percent and 50 per- cent, FCR was better than the normal CP treatment.
dominal fat pad are ma- jor issues in meat chick- ens fed low CP diets but a partial replacement of dietary Arg with GAA may help to solve these issues.
Dietary creatine and its endogenous amino acid precursors arginine and glycine are naturally low in low crude protein meat
Day-old Ross 308 male broilers were assigned to nine dietary treatments with eight replicates of 10 birds each.
The treatment diets were offered during the grower and finisher phas- es from days 10 to 24 and days 25 to 42, respec- tively.
Breast meat creatine concentration was posi- tively correlated to feed efficiency and breast meat moisture and nega- tively correlated to rela-
Using GA A by the method described herein may be a nutritional strat- egy for the successful im- plementation of low CP feeding program for meat chickens.
Funded by Poultry Hub Australia, the project investi- gated the rate at which GAA can spare Arg with and without betaine in moderately low CP diets.
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National Poultry Newspaper, December 2021 – Page 7
GA A is a direct precur- sor of creatine and can be used to replace A rg for creatine synthesis.
• A low CP (-15 g/kg) diet deficient in Arg (low CP - Arg)
The hepatic synthesis of creatine from GA A uses methyl groups and thus supplemental betaine with GA A may be useful.
•AlowCPdietsuf- ficient in arginine (low CP + Arg)
When Arg was added back to the Arg deficient diet, growth performance and breast meat loss were restored.
or absence of betaine. The results highlighted the importance of sparing dietary Arg with GAA in low CP meat chicken
The treatments were:
The birds offered a low CP A rg deficient diet had
Figure 1. Linear relationship between breast meat creatine concen- tration and FCR (d10 to 42) of broilers offered low crude protein diets with guanidinoacetic acid and betaine.
Results
A nutritional strategy to improve feed efficiency and decrease abdominal fat pad in meat chickens fed low crude protein diets was presented in Ideas Exchange 2021 conference.
Figure 2. Linear relationship between breast meat creatine concentra- tion and relative weight of abdominal fat at d 42 of broilers offered low crude protein diets with guanidinoacetic acid and betaine (P < 0.01).
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