کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2440526 | 1108119 | 2008 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The Effect of Herbage Allowance and Concentrate Supplementation on Milk Production Performance and Dry Matter Intake of Spring-Calving Dairy Cows in Early Lactation
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
The objective of this study was to determine the effect of daily herbage allowance (DHA) and concentrate level on milk production and dry matter intake of spring-calving dairy cows in early lactation. Seventy-two Holstein-Friesian dairy cows (mean calving date February 2) were randomly assigned across 6 treatments (n = 12) in a 2Â ÃÂ 3 factorial arrangement. The 6 treatments consisted of 2 DHA (Â >Â 4Â cm) and 3 concentrate levels: 13Â kg of herbage dry matter/cow per d (low) or 17Â kg of herbage dry matter/cow per d (high) DHA and unsupplemented, 3Â kg, or 6Â kg of dry matter concentrate/cow per d. The experimental period (period I) lasted 77 d and was followed by a carryover period (period II) during which animals were randomly reassigned across 2 grazing treatments offering 17 or 21Â kg of herbage dry matter/cow per d. Increasing DHA significantly increased milk (+1.85Â kg), solids-corrected milk, protein (+79.5Â g), and lactose yields, protein concentration, and mean body weight (BW). Mean body condition score (BCS) and end-point BCS were also significantly higher with the high-DHA treatments. There was a linear response in milk yield, milk lactose concentration, and solids-corrected milk to concentrate supplementation. There was a significant difference in mean BW as concentrate increased from 0 to 3Â kg (506 and 524Â kg, respectively); there was no further increase in BW when 6Â kg of concentrate was offered. Cows offered the low DHA had significantly lower grass dry matter intake (13.3Â kg) and total dry matter intake (16.3Â kg) than the high-DHA cows during period I. Concentrate supplementation significantly increased total dry matter intake. During period II, previous DHA continued to have a significant carryover effect on milk protein concentration, BW change, mean BCS, and end-point BCS. Concentrate supplementation during period I continued to have a significant carryover effect in period II on milk yield; milk fat, protein, and lactose yields; solids-corrected milk yield; BW; and mean BCS. Results from this study indicate that offering a medium level of DHA (17Â kg of herbage dry matter) in early lactation will increase milk production. Offering concentrate will result in a linear increase in milk production. In an early spring feed-budgeting scenario, when grass supply is in deficit, offering 3Â kg of dry matter concentrate with 17Â kg of DHA has the additive effect of maintaining the grazing rotation at the target length as well as ensuring the herd is adequately fed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 91, Issue 3, March 2008, Pages 1258-1269
Journal: Journal of Dairy Science - Volume 91, Issue 3, March 2008, Pages 1258-1269
نویسندگان
M. McEvoy, E. Kennedy, J.P. Murphy, T.M. Boland, L. Delaby, M. O'Donovan,