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Silage and milk production a comparison between grass silages of different chop lengths and digestibilities



Silage and milk production a comparison between grass silages of different chop lengths and digestibilities



Grass and Forage Science 36(1): 31-38



Four grass silages of 2 chop lengths and 2 D-values were made from S23 perennial ryegrass and compared in a feeding experiment with lactating cows and in an eating-behavior study with non-lactating cows. The median chop lengths were 11.6 and 11.5 mm in the short silages and 18.2 and 19.5 mm in the medium silages. Chop length had negligible effects on D-value and on pH with values of 3.81 and 3.94 on the short and medium silages, respectively. Silage DM intakes were higher on the short than on the medium-chop silages in both experiments except where the high D-value silage was supplemented with concentrates. Milk yields were not affected significantly by chop length with daily values of 19.3 and 19.7 kg/cow on the short and medium treatments, respectively, with the high D-value silage and 18.2 and 18.3 kg/cow with the low D-value silage. Chop length had only small and non-significant effects on milk composition. Eating times expressed as minutes per kilogram DM were significantly lower on the short than on the medium-chop silages. The small differences between the short- and the medium-chop silages were of no economic importance.

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Accession: 006415462

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DOI: 10.1111/j.1365-2494.1981.tb01536.x


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