Table 2.

Proportion of Leucaena in the diet, and the urine and feces production of the cows that grazed in the MS and SPS for the rainy and dry seasons in Mérida, Yucatán, México.

Parameter	Rainy		Dry
	MS	SPS	MS	SPS
% of L. leucocephala a	0.0	19.0	0.0	18.9
Urine b (L/AU/day−1)	13.48 ± 1.06	11.34 ± 1.53	13.16 ± 1.39	13.21 ± 1.53
Feces c (kg DM/AU/day−1)	1.55 ± 0.06 aA	1.75 ± 0.06 bA	1.7 ± 0.10 B	1.53 ± 0.05 B

^a—percentage of Leucaena material in the diet of the animals, as estimated by the ¹³C technique applied to the material of the feces of the animals combined with the digestibility information of the legume; b—estimated by “spot” sampling; and c—estimated by the chromium oxide external marker technique. Lower case letters represent a comparison of the means of the pasture type within the season, and upper-case letters are the comparison of the means between the seasons for the same pasture. Different letters indicate significant differences (according to the Tukey test (p = 0.05)).