Immediate and residual effects on milk yield and composition of decreasing levels of udder emptying during milking in dairy cows

Abstract : The quantity of milk accumulated in the udder, under extended milking intervals, could reduce milk yield, with residual effects on following milking intervals. Aim of the trial was to modify the quantity of milk stored in the udder over one milking interval, by decreasing udder emptying (100, 70, 40, and 0% ), in order to describe the short-term effects on milk yield and composition. 16 dairy cows averaging 41 kg/d of milk were assigned to treatments 100, 70, 40, and 0% according to a Latin square design with four 7 -d periods. Cows were milked twice daily at 0700 and 1730. Treatments were applied at the morning milking called MO. Changes in milk yield and composition were assessed on the 7 following milking (Ml to M7), using the mixed procedure of SAS with milking as repeated measures. The quantity of milk collected at Ml milking linearly increased as udder emptying decreased at MO. Nevertheless, because of milk accumulation in the udder, MO+Ml milk yield was quadratically depressed by -1.5, -5.3, -12.9 kg with 70,40 and 0% treatments, respectively. Residual effects on milk yield were only observed for 40 and 0% treatments on M2 and M3 milking and did not differ between 40 and 0% treatments. Milk fat content increased only for treatment 0% at Ml and for treatments 40 and 00/o at M2. Milk lactose content was lower for treatments 40 and 0% at Ml and only for treatment 0% till M4. Lower milk: protein contents were observed from M2 till M5 milking for either treatment 40 or 0% or both. Till M5 milking, somatic cell score linearly increased as udder emptying decreased at MO. In conclusion, a 70%-emptying milking at one milking did not alter milk yield and composition in dairy cows. Residual effects on milk yield and composition were only observed for higher amounts of milk: accumulated in the udder.
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Conference papers
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Submitted on : Friday, September 7, 2012 - 3:37:51 PM
Last modification on : Wednesday, July 18, 2018 - 3:16:01 PM

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Jocelyne Guinard-Flament, A. Albaaj, C. Hurtaud, S. Lemosquet, Pierre-Guy Marnet. Immediate and residual effects on milk yield and composition of decreasing levels of udder emptying during milking in dairy cows. 62nd annual meeting of the European Association for Animal Production, Aug 2011, Stavanger (NOR), Norway. 223 p. ⟨hal-00729374⟩

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