Brown midrib forage sorghum silage for the dairy cow: nutritive value and comparison with corn silage in the diet
Articolo
Data di Pubblicazione:
2010
Citazione:
Brown midrib forage sorghum silage for the dairy cow: nutritive value and comparison with corn silage in the diet / S. Colombini, L. Rapetti, D. Colombo, G. Galassi, G. M. Crovetto. - In: ITALIAN JOURNAL OF ANIMAL SCIENCE. - ISSN 1594-4077. - 9:3(2010), pp. 273-277.
Abstract:
Rumen dry matter and fibre digestibility of brown midrib (BMR) sorghum forage silage (SF) in comparison to corn silage (CS) was determined in situ using 3 fistulated dry cows. The effect of replacing CS with SF on milk production was studied in a change-over design with 58 lactating Italian Friesian cows fed two diets with similar composition (15.5 CP, 31.5 NDF and 24.2% starch, on DM).
CS had a higher rapidly degradable DM fraction than SF (33.1 vs 23.7 P<0.001), whilst the slowly degradable fraction was not different (46.3 vs 48.7; NS). Overall, the extent of DM rumen degradability was higher for CS.
Rumen digestion rate (%/h) of aNDFom was higher for SF than CS (3.08 vs 2.49 %/h, P=0.06) however, effective rumen degradability of fibre was not different between silages.
Neither milk yield (kg/d) and 4%-FCM nor milk protein and fat contents were affected by treatment. CS diet had a lower milk urea content (19.9 vs 21.5 mg/dL, P<0.05) suggesting a better Nnitrogen utilization at the rumen level for this diet.
In conclusion feeding a BMR sorghum forage resulted in milk yield and quality similar to corn silage. However, to obtain comparable milk production as corn silage, the SF-based diet had to be supplemented with more starch from corn meal.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Brown midrib sorghum forage; Milk production; Neutral detergent fibre; Rumen degradability
Elenco autori:
S. Colombini, L. Rapetti, D. Colombo, G. Galassi, G. M. Crovetto
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