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Ryegrass or alfalfa silage as the dietary forage for lactating dairy cows.
J Dairy Sci. 2002 Jul; 85(7):1894-901.JD

Abstract

Renewed interest exists in using grass forages to dilute the higher crude protein (CP) and lower digestible fiber present in legumes fed to lactating dairy cows. A 3 x 3 Latin square feeding study with 4-wk periods was conducted with 24 Holstein cows to compare ryegrass silage, either untreated control or macerated (intensively conditioned) before ensiling, with alfalfa silage as the sole dietary forage. Ryegrass silages averaged [dry matter (DM) basis] 18.4% CP, 50% neutral detergent fiber (NDF), and 10% indigestible acid detergent fiber (ADF) (control) and 16.6% CP, 51% NDF, and 12% indigestible ADF (macerated). Alfalfa silage was higher in CP (21.6%) and lower in NDF (44%) but higher in indigestible ADF (26%). A lower proportion of the total N in macerated ryegrass silage was present as nonprotein N than in control ryegrass and alfalfa silages. Diets were formulated to contain 41% DM from either rye-grass silage, or 51% DM from alfalfa silage, plus high moisture corn, and protein concentrates. Diets averaged 17.5% CP and 28 to 29% NDF. The shortfall in CP on ryegrass was made up by feeding 7.6% more soybean meal. Intake and milk yields were similar on control and macerated ryegrass; however, DM intake was 8.3 kg/d greater on the alfalfa diet. Moreover, feeding the alfalfa diet increased BW gain (0.48 kg/d) and yield of milk (6.1 kg/d), FCM (6.8 kg/d), fat (0.26 kg/d), protein (0.25 kg/d), lactose (0.35 kg/d), and SNF (0.65 kg/d) versus the mean of the two ryegrass diets. Both DM efficiency (milk/DM intake) and N efficiency (milk-N/N-intake) were 27% greater, and apparent digestibility was 16% greater for DM and 53% greater for NDF and ADF, on the ryegrass diets. However, apparent digestibility of digestible ADF was greater on alfalfa (96%) than on ryegrass (average = 91%). Also, dietary energy content (estimated as net energy of lactation required for maintenance, milk yield, and weight gain) per unit of digested DM was similar for all three diets. Results of this trial indicated that, relative to ryegrass silage, feeding alfalfa silage stimulated much greater feed intake, which supported greater milk production.

Authors+Show Affiliations

Agricultural Research Service, USDA US Dairy Forage Research Center, Madison 53706, USA. glenb@dfrc.wisc.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12201541

Citation

Broderick, G A., et al. "Ryegrass or Alfalfa Silage as the Dietary Forage for Lactating Dairy Cows." Journal of Dairy Science, vol. 85, no. 7, 2002, pp. 1894-901.
Broderick GA, Koegel RG, Walgenbach RP, et al. Ryegrass or alfalfa silage as the dietary forage for lactating dairy cows. J Dairy Sci. 2002;85(7):1894-901.
Broderick, G. A., Koegel, R. G., Walgenbach, R. P., & Kraus, T. J. (2002). Ryegrass or alfalfa silage as the dietary forage for lactating dairy cows. Journal of Dairy Science, 85(7), 1894-901.
Broderick GA, et al. Ryegrass or Alfalfa Silage as the Dietary Forage for Lactating Dairy Cows. J Dairy Sci. 2002;85(7):1894-901. PubMed PMID: 12201541.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ryegrass or alfalfa silage as the dietary forage for lactating dairy cows. AU - Broderick,G A, AU - Koegel,R G, AU - Walgenbach,R P, AU - Kraus,T J, PY - 2002/8/31/pubmed PY - 2003/3/21/medline PY - 2002/8/31/entrez SP - 1894 EP - 901 JF - Journal of dairy science JO - J Dairy Sci VL - 85 IS - 7 N2 - Renewed interest exists in using grass forages to dilute the higher crude protein (CP) and lower digestible fiber present in legumes fed to lactating dairy cows. A 3 x 3 Latin square feeding study with 4-wk periods was conducted with 24 Holstein cows to compare ryegrass silage, either untreated control or macerated (intensively conditioned) before ensiling, with alfalfa silage as the sole dietary forage. Ryegrass silages averaged [dry matter (DM) basis] 18.4% CP, 50% neutral detergent fiber (NDF), and 10% indigestible acid detergent fiber (ADF) (control) and 16.6% CP, 51% NDF, and 12% indigestible ADF (macerated). Alfalfa silage was higher in CP (21.6%) and lower in NDF (44%) but higher in indigestible ADF (26%). A lower proportion of the total N in macerated ryegrass silage was present as nonprotein N than in control ryegrass and alfalfa silages. Diets were formulated to contain 41% DM from either rye-grass silage, or 51% DM from alfalfa silage, plus high moisture corn, and protein concentrates. Diets averaged 17.5% CP and 28 to 29% NDF. The shortfall in CP on ryegrass was made up by feeding 7.6% more soybean meal. Intake and milk yields were similar on control and macerated ryegrass; however, DM intake was 8.3 kg/d greater on the alfalfa diet. Moreover, feeding the alfalfa diet increased BW gain (0.48 kg/d) and yield of milk (6.1 kg/d), FCM (6.8 kg/d), fat (0.26 kg/d), protein (0.25 kg/d), lactose (0.35 kg/d), and SNF (0.65 kg/d) versus the mean of the two ryegrass diets. Both DM efficiency (milk/DM intake) and N efficiency (milk-N/N-intake) were 27% greater, and apparent digestibility was 16% greater for DM and 53% greater for NDF and ADF, on the ryegrass diets. However, apparent digestibility of digestible ADF was greater on alfalfa (96%) than on ryegrass (average = 91%). Also, dietary energy content (estimated as net energy of lactation required for maintenance, milk yield, and weight gain) per unit of digested DM was similar for all three diets. Results of this trial indicated that, relative to ryegrass silage, feeding alfalfa silage stimulated much greater feed intake, which supported greater milk production. SN - 0022-0302 UR - https://www.unboundmedicine.com/medline/citation/12201541/Ryegrass_or_alfalfa_silage_as_the_dietary_forage_for_lactating_dairy_cows_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(02)74264-1 DB - PRIME DP - Unbound Medicine ER -