Study of arginine partition for maintenance protein metabolism and protein deposit...
A reassessment of Japanese quail responses in the laying phase to arginine intake ...
Energy partitioning for maintenance and egg production under heat stress
| Full text | |
| Author(s): |
Martinez, K. N. M.
[1]
;
Viana, G. da S.
[2]
;
da Silva, E. P.
[1]
;
Reis, M. P.
[1]
;
Gous, R. M.
[3]
;
Sakomura, N. K.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Estadual Paulista Julio de Mesquita Filho UN, Fac Ciencias Agr & Vet FCAV, Jaboticabal - Brazil
[2] Nat Resources Inst Finland, Prod Syst, Luke - Finland
[3] Univ KwaZulu Natal, Sch Agr Earth & Environm Sci, Pietermaritzburg - South Africa
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | BRITISH POULTRY SCIENCE; v. 62, n. 5, p. 726-730, SEP 3 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
1. A feeding trial was conducted to measure the responses of Japanese quail to dietary valine. In total, 280 Japanese quail were randomly assigned to eight treatments giving seven replicates (cage - 35 cm length, 35 cm width x 15 cm high). Experimental diets were formulated using a dilution technique to give a range dietary Val concentration (1.97 to 9.85 g/kg). 2. Feed intake was maximised at 6.66 g Val/kg and above, but declined linearly below this level. Body weight reached a maximum of 170 g on 6.66 g Val/kg. Egg output peaked at 9.5 +/- 0.3 g/bird/d with an egg weight of 11 g for the 6.66 g Val/kg diet. Rate of laying for the group that received the feed with the lowest Val content was close to zero (1.40%), but egg weight on this treatment was 70% of the maximum egg weight. Valine required per gram of egg output was estimated as 10.6 mg/g, whereas the maintenance requirement was 159 mg/kg body weight. Val required for maximum egg output was estimated in 154 mg/d. 3. The marginal cost of Val in Brazil currently is negative below a level of 8.0 g/kg feed, which is above that required for maximum egg output. Consequently, Val cannot be regarded as a limiting amino acid currently, as the optimum economic intake exceeds the requirements of all the individuals in the population. The price of a quail egg weighing 11 g in Brazil at the time of the experiment was R\$ 0.021. Even if the marginal revenue for these eggs was doubled to 0.4 c/g, there would be no reason to increase the intake of Val. (AU) | |
| FAPESP's process: | 16/11172-5 - Computational model for growth simulation and optimization of nutritional levels for broilers |
| Grantee: | Matheus de Paula Reis |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/25761-4 - Modeling production and nutritional requirements of poultry and fish |
| Grantee: | Nilva Kazue Sakomura |
| Support Opportunities: | Research Projects - Thematic Grants |