Predicting nitrogen use efficiency, nitrogen loss and dry matter intake of individual dairy cows in late lactation by including mid-infrared spectra of milk samples

Table 1 Description of diets used in this study

Trial	Description	Diet components¹	Animals
T1	Four subgroups with small amounts of a yeast culture (different levels), which do not affect the ratio of different components in the ration: subgroup 1 includes no yeast culture, subgroup 2 includes 1%² of yeast culture A, subgroup 3 includes 2% of yeast culture A, and subgroup 4 includes 1% of yeast culture B	DM: 58.8%, CP: 17.0% C:R = 56:44	56
T2	Three subgroups with different levels of roughage offered	Group 1: DM: 61.5%, CP: 17.0% C:R = 61:39	30
		Group 2: DM: 55.7%, CP: 17.0% C:R = 59:41
		Group 3: DM: 51.0%, CP: 17.2% C:R = 56:44
Regular	Regular diet offered in the experimental farm	DM: 56.8%, CP: 16.8% C:R = 55:45	-

¹DM dry matter, CP crude protein, C:R ratio of concentrate to roughage on a dry matter basis. The main roughages for all the diets were maize silage and alfalfa, and the concentrates were mainly constituted by maize and soyabean meal
²1% indicates that the weight of added yeast culture is equal to the 1% DM of concentrates of subgroup 1. The diets in 4 subgroups of T1 were adjusted to keep the DM, CP, and C:R consistent

ISSN: 2049-1891