Isoleucine assay

Graded doses of digestible isoleucine (4.5-9.5 g kg-1) resulted in quadratic (P < 0.01) responses in both weight gain and feed efficiency (Fig. 13.5). The broken-line requirement estimates were 5.89 g kg 1 for weight gain and 5.81 g kg-1 for gain/feed ratio (Baker et al., 2002). Thus, the ideal ratio of isoleucine:lysine was determined to be 61.4% (5.89 - 9.60 x 100). This value is lower than our original estimate of 67% (Baker, 1997).

The predicted digestible isoleucine requirement for chicks for 0-3 weeks posthatching is 6.57 g kg-1 (0.614 x 10.7) which is similar to the 6.79 g kg 1 requirement predicted from the first intercept value of the broken line plateau with the quadratic fitted line (Fig. 13.5). Extrapolation of this requirement estimate to chicks fed a maize-soybean meal diet where isoleucine digestibility is 91% (NRC, 1994) results in a total predicted isoleucine requirement of 7.22 g kg which is lower than the 8.0 g kg-1 estimate of NRC (1994).

Was this article helpful?

0 0
100 Weight Loss Tips

100 Weight Loss Tips

Make a plan If you want to lose weight, you need to make a plan for it. Planning involves setting your goals both short term and long term ones. With proper planning, you would be able to have an effective guide on the steps that you want to take, towards losing pounds of weight. Aside from that, it would also keep you motivated.

Get My Free Ebook

Post a comment