Abstract
Proper nutritional management during the dry period is required to prevent metabolic disorders during the time of parturition and for potential increase milk yield during early lactation, especially under the heat of summer. The effect of prepartum diets on partitioning of nitrogen (N), calcium (Ca), phosphorus (P), magnesium (Mg) and potassium (K) during dry period and early lactation in summer was investigated. Nine cows were assigned to two groups and fed either control (group C: four cows) or high concentrate (group H: five cows) diets to meet 110% of their requirements before parturition. The proportion of concentrate in control diet was 35%, and that in the high concentrate diet was 45%. After parturition, all cows were fed the same diets ad libitum during lactation. Balance trials were conducted at 9, 8 and 7 days before parturition and at 12, 13 and 14 days after parturition. Before parturition, dry matter intake (DMI), DM and NFE digestibility in group C tended to be lower than those in group H. The retention of N (p<0.01) and P (p<0.05) in group C during the dry period was significantly lower than those in group H. The retention of Mg in group C during the dry period tended to be lower than in group H. The concentration of plasma NEFA in group C tended to be higher than in group H during dry period. The prepartum diet did not have an apparent effect on DMI and milk yield at 2 weeks after parturition and N, C a , P, Mg and K balance after parturition.
Highlights
The negative effect of heat stress on dry matter intake (DMI), milk yield and composition of dairy cows has been widely demonstrated (Rodriguez et al, 1985; Kume et al, 1990)
In the previous report (Kamiya et al, 2006), we investigated the effects of prepartum diet on DMI during parturition and milk production and showed that supplementation of concentrate to prepartum diet prevented the decline of DMI before parturition
We investigated the effects of forage to concentrate ratio in prepartum diet on nutrient balance and plasma metabolites in dairy cows around parturition during a hot summer
Summary
The negative effect of heat stress on dry matter intake (DMI), milk yield and composition of dairy cows has been widely demonstrated (Rodriguez et al, 1985; Kume et al, 1990). The effects of prepartum diet on nutrient metabolism of heat stressed dairy cows in periparturient period have not been well clarified. We investigated the effects of forage to concentrate ratio in prepartum diet on nutrient balance and plasma metabolites in dairy cows around parturition during a hot summer. The prepartum diet did not affect the RT at 09:00 h and 16:00 h during both dry and lactation period.
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