Optimal in-feed threonine and tryptophan ratio for replacement chickens: the theoretical background

M.J. Krivenok, I.I. Ilchuk, V.M. Mykhalska

Abstract


We determined the optimal content and ratio of threonine and tryptophan in the mix fodder of replacement chicks at different periods of their growing. We studied the effect of different levels of threonine and tryptophan in mixed fodder on chicken growth and development. We registered that under optimal AA content and ratio the replacement chickens at the end of the growing period outweighed the chickens from control group by 140 g. We also studied the influence of different content of AA and temporal changes in their ratio on digestibility of feed nutrients by replacement chickens from market egg flock. It was found that the optimal content of threonine and tryptophan and their ratio at certain periods of chicken growth caused the increase in digestibility of protein by 2 %, fiber – by 1 %, and BEV – by 2 %. We also proved that the decrease or increase of AA ratio in mix fodder of replacement chickens leads to the manifestation of antagonism between amino acids and the deterioration of their function in bird organism. The changes in AA ratio had significant effects on chicken productivity, the digestibility of feed nutrients, the assimilation, and efficiency of amino acid use. This effects were considerably stronger than the effect of changes in AA content. The degree of influence of the ratio between threonine and tryptophan varies throughout the growing period, it has been established that the ratio of threonine to tryptophan in the period of limited chick feeding (9-6 weeks) has a lesser effect on the productivity of repair young (R2 = 0.89) the second one (R2 = 0.92) and the last growing periods (R2 = 0.92). We performed a mathematical model (polynomial trend line) to describe the growth of replacement chickens during all experiment periods, the pattern of dependences between chicken organism and AA content, AA ratio, age, and productivity. This nonlinear model is more relevant and reliable than linear dependence.


Keywords


replacement chickens; essential amino acids; threonine; tryptophan; optimal dietary AA ration

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References


Arkhypov, A.V., Toporova, L.V. (1984). Proteynovoe y amynokyslotnoe pytanye ptytsy. Moscow, Kolos (in Russian).

Baker, D.H., Batal, A.B., Parr, T.M., Augspurger, N.R., Parsons, C.M. (2002). Ideal ratio (relative to lysine) of tryptophan, threonine, isoleucine, and valine for chicks during the second and third weeks posthatch. Poult. Sci, 81, 485–494. doi: 10.1093/ps/81.4.485

Calderon, V.M., Jensen, L.S. (1990). The requirement for sulfur amino acid by laying hens as influenced by the protein concentration. Poultry Science, 69(6), 934–944.

Cave, N.A. (1982). Use of dietary ammonium sulfate in control of growth rate of broiler breeder replacement pullets from one day of age. Poultry Science, 61(9), 1859–1865.

Chung, Т.К., Baker, D.H. (1992). Methionine requirement of pigs between 5 and 20 kilograms body weight. J. Anim. Science, 70(6), 1857–1863.

Corrent, E., Bartelt, J. (2011). Valine and isoleucine: The next limiting amino acids in broiler diets. Lohmann Inf, 46, 59–67.

Han, Y.M., Baker, D.H. (1991). Lysine requirements of fast– and slow–growing broiler chicks. Poultry Science, 70(10), 2108–2114.

Kononenko, V.K., Ibatullin, I.I., Patrov, V.S. (2000). Praktykum z osnov naukovykh doslidzhen u tvarynnytstvi. Kiev (in Ukrainian).

Kriukov, B., Bevziu, V., Polunyna, S. (1997). Vybor kormov s vysokym soderzhanyem proteyna. Ptytsevodstvo, 6, 17–18 (in Russian).

Kryvenok, M.Ia., Ilchuk, I.I. (2016). Teoretychne obgruntuvannia spivvidnoshennia metioninu i treoninu u ratsionakh remontnykh kurchat. Suchasne ptakhivnytstvo, 6, 10–11 (in Ukrainian).

Lakyn, H.F. (1990). Byometryia. Moscow, Vyshshaya shkola (in Russian).

Mack, S., Becovici, D., De Groote, G., Leclercq, B., Lippens, M. et al. (1999). Ideal amino acid profile and dietary lysine specification for broiler chickens of 20–40 days age. Br. Poult. Sci, 40, 257–265. doi: 10.1080/00071669987683.

Mehri, M., Davarpanah, A.A., Mirzael, H.R. (2012). Estimation of ideal ratios of methionine and threonine to lysine in starting broiler chicks using response surface methodology. Poult. Sci, 91. 771–777. doi: 10.3382/ps.2011–01818.

Podobed, L.I. (2010). Proteynovoe y amynokyslotnoe pytanye selskokhoziaistvennoi ptytsу: struktura, ystochnyky, optymyzatsyia. Dnepropetrovsk, OOO PKF ART–PRESS (in Russian).

Rymbak, M., Khammer, Y. (2008). Usvoiaemye amynokysloty – stroytelnyi materyal dlia podderzhky y produktyvnosty. Uspekh v khlevu, 1, 16 (in Russian).

Samadi, L.F. (2008). Modelling the optimal lysine to threonine ratio in growing chickens depending on age and efficiency of dietary amino acid utilisation. Br. Poult. Sci, 49, 45–54. doi: 10.1080/00071660701821667.

Svezhentsov, A.A., Horlach, S.A., Martyniak, S.V. (2008). Kombykorma, premyksy, BVMD dlia zhyvotnykh y ptytsy. Dnepropetrovsk, OOO PKF ART–PRESS (in Russian).

Wecke, C., Liebert, F. (2013) Improving the Reliability of Optimal In–Feed Amino Acid Ratios Based on Individual Amino Acid Efficiency Data from N Balance Studies in Growing Chicken. Animals (Basel). 2013 Sep, 3(3), 558–573. doi: 10.3390/ani3030558.




DOI: http://dx.doi.org/10.15421/2017_57

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© 2017 Ukrainian Journal of Ecology. ISSN 2520-2138