Dairy cow performance and labour inputs associated with two silage feeding systems

Abstract

AbstractTwo experiments were conducted to examine the effect of two winter feeding systems on the performance of dairy cows in early lactation. Experiments 1 (144 d duration) and 2 (146 d duration) involved sixty‐four (primiparous) and eighty‐six (primiparous and multiparous) Holstein Friesian dairy cows respectively. Rations offered comprised grass silage, maize silage [0·26–0·29 of forage dry matter (DM)] and concentrates (10–12 kg d−1). With the complete diet (treatment CD), the forage and concentrate components were mixed using a complete diet mixer wagon, and offered daily in the form of a ‘complete diet’. With the easy feed (treatment EF), the dairy cows were offered the forage component of the ration twice weekly in whole blocks, in quantities sufficient for the following 3‐ or 4‐d period, while the concentrate component of the diet was offered via electronic out‐of‐parlour feeding stations. Total DM intakes were similar, namely 17·6 and 17·0 kg d−1 (Experiment 1) and 18·7 and 18·5 kg d−1 (Experiment 2), for treatments CD and EF respectively. Feeding system had no significant effect on milk yield, milk fat or milk protein content, or on end of study indices of body tissue reserves in either experiment (P > 0·05). Similarly, feeding system had no significant effect on the digestibility of the ration measured in Experiment 2 (P > 0·05). Feeding times associated with each component of the two feeding systems were measured, and these were then used to calculate total feeding time for a 97‐cow dairy herd. Calculated feeding times for this herd were 209·3 and 156·0 min week−1 for treatments CD and EF respectively.