I. Hap et K. Simecek, ANALYSIS OF RELATIONSHIPS BETWEEN ZINC UP TAKE, ITS DIGESTIBILITY ANDRETENTION IN YOUNG-PIGS, Zivocisna vyroba, 39(6), 1994, pp. 505-514
The objective of the paper was to describe the effect of basic indicat
ors on zinc digestibility and retention on the basis of regression and
correlation analyses. The shape of regression curves has indicated th
at zinc digestion as well as zinc retention per unit of metabolic size
showed a parabolic dependence with the growing zinc uptake (y = 1.952
- 0.621 x + 0.069 x2; I(k) = 0.747, y = Zn deposition in mg/W0.75; x
= Zn uptake in mg/W0.75). Zinc digestion and zinc retention per unit o
f metabolic size had a permanently growing trend. Similar trends like
those of absolute zinc retention and digestion per unit of metabolic s
ize were determined for relative values of zinc digestibility and rete
ntion. According to our calculations the lowest relative zinc digestio
n (20.6%) from zinc uptake corresponded to the level of 6.1 mg of zinc
uptake per unit of metabolic size, and/or the lowest relative zinc re
tention (15.44%) corresponded to the level of 5.7 mg zinc uptake per u
nit of metabolic size. Besides the determinative effect of zinc uptake
on zinc retention, the effect of calcium uptake and the effect of met
abolic size of the individual was also obvious. While the effect of ca
lcium influenced zinc retention from 2.8% and 27.46% in the given mode
l, the effect of metabolic size is much more significant and equals 49
.53 and/or 51.23% out of the total effect of particular factors of mul
tiple regression. According to the values of calculated coefficients,
it is possible to expect certain regression in zinc retention with the
growing metabolic size. As for the effect of age, it was not a factor
influencing zinc retention in a decisive way.