High Oil Corn as Silage or Grain for Dairy Cows During an Entire Lactation

Abstract

Forty-five multiparous Holstein cows were used to compare the effects of diets that contained high oil corn grain, high oil corn silage, or a combination of both. At wk 4 after calving, cows were assigned to one of four treatment in a 2 (silage type) x 2 (grain type) factorial arrangement: 1) control silage and control grain, 2) high oil silage and control grain, 3) control silage and high oil grain, or 4) high oil silage and high oil grain. Diets contained haylage, corn silage, and concentrate (25:25:50, DM basis); corn grain was 27% of dietary DM. Data were analyzed for wk 4 to 17 and wk 4 to 43 of lactation and adjusted for covariate measurements made during wk 3. During wk 4 to 43, DMI increased when high oil grain was included in the diet, but was unaffected by type of silage. During wk 4 to 43 of lactation, yields of milk, CP, and fat; percentages and yields of N components in milk; body condition score; BW; and concentrations of NEFA, glucose, BHBA, and urea N in plasma were not affected by type of silage or corn grain fed. Results were similar for wk 4 to 17, except that milk yield tended to be higher for cows fed the high oil grain, and CP content of milk was lower when high oil corn silage was in the diet. Compared with corn grain from typical hybrids, high oil grain may improve DMI and milk yield of dairy cows during early lactation.

Morphological fractions, chemical composition and in vitro fermentation characteristics of maize stover of five genotypes

“…The Tang, Gan, Sheng, Tan, Tayo, Sun, Wang and Ren differences in the P content of maize stover among the genotypes, despite similar soil and agronomic conditions and same P application levels, suggested differences in genetic potential between genotypes in P enrichment. The weighted mean of P content (1.28 g/kg DM) of stover fractions from the five genotypes was lower not only than that from corn silage (2.0 g/kg DM, Lacount et al, 1995) but also than that from whole rice plant silage (2.8 g/kg DM, Islam et al, 2001). The possible reason may be the differences in the varieties and agronomic conditions applied in the different studies.…”

The effect of feeding diets markedly differing in the proportion of grass and maize silages on bovine milk fat composition

“…However, some other factors should be reasoned. The milk fat composition can be affected by different vegetation stages of ensiled forage (Vanhatalo et al, 2007), different botanical composition and origin of ensiled grasses (Collomb et al, 1999;Leiber et al, 2005) or by different hybrids of ensiled maize (LaCount et al, 1995). For instance, Michalet-Doreau and Doreau (1999) reported the effect of maize silages containing up to 30-40% of grains with a high content of linoleic acid.…”

Morphological fractions and <i>in vitro</i> fermentation characteristics of five endosperm types maize stover harvested at two maturity stages

“…In previous studies (Lacount et al, 1995;Akay and Jackson, 2001), the waxy, high oil and fodder maize varieties also had higher CP and lower NDF and ADF content than conventional variety. Mustafa et al (2004) reported that NDF and ADF contents of sweet maize variety stover are 571 and 301 g/kg DM, respectively, lower than the results of conventional variety reported in present study, but the content of CP (99 g/kg DM) is higher than that in present study (Table 2).…”