Two data files, one from New Hampshire (n = 3308) and one from Georgia (n = 678), containing 4-wk or weekly means, respectively, of ad libitum dry matter intakes ( @entity9956 ) and related variables were used to predict @entity9956 and yields of 4% fat-corrected milk and milk protein in lactating Holstein @entity291 . The @entity9956 ranged from 5.9 to 30.4 kg/d, and milk yield ranged from 5.8 to 64.3 kg/d. Because of the lack of data from < 14 d in milk, prediction was not possible for the first 2 wk of lactation. Factors considered for inclusion in the @entity9956 prediction model were parity number (1 or > or = 2), treatment with @entity291 somatotropin (bST), day of year, days in milk, minimum (nighttime) temperature-humidity index, body weight, 4% fat-corrected milk yield, milk protein yield, and @entity4336 silage and total silage percentages in forage dry matter. In separate models, the silage predictors were replaced with more specific descriptors of ration dry matter, including percentages of crude protein, fat (ether extract plus soaps of @entity1718 ), concentrate, acid detergent fiber or neutral detergent fiber, and forage acid detergent fiber or neutral detergent fiber. The square and sometimes natural logarithm of predictors were included in models, which then were subjected to a stepwise backward elimination option of a multiple regression procedure. Several useful equations were developed to predict ad libitum @entity9956 ; the best models accounted for about 80% of the variability in @entity9956 , and standard deviations were < 9% of mean @entity9956 . @entity308 in @entity9956 related to heat stress was higher in pluriparous @entity291 than in primiparous @entity291 (22% vs. 6%). The negative coefficient for effects of bST treatment on @entity9956 suggested that milk yield increased proportionally more in response to bST than did @entity9956 . About 74 to 77% of @entity9956 predictions were within 2 kg/d of observed @entity9956 .

Predicting ad libitum dry matter intake and yield of Holstein XXXX .

@entity308 :: ('MESH:D003866', 'Disease') :: ['Depression'] @entity4336 :: ('381124', 'Species') :: ['corn'] @entity9956 :: ('CHEBI:47781', 'Chemical') :: ['DMI'] @entity1718 :: ('MESH:D005227', 'Chemical') :: ['fatty acids'] @entity291 :: ('9913', 'Species') :: ['cows', 'bovine']
@entity291 :: (9913,Species) :: ['cows']
