Last update: March 30, 2012 10:36:37 AM E-mail Print

 

A REPORT ON THE CONSUMPTION, COMPOSITION AND NUTRITIONAL ADEQUACY OF A MIXTURE OF LUSH GREEN PERENNIAL RYEGRASS (LOLIUM PERENNE) AND COCKSFOOT (DACTYLIS GLOMERATA) FED AD LIBITUM TO THOROUGHBRED MARES

C.H.B. MARLOW, E.M. VAN TONDER, F.C. HAYWARD, SOPHIA S. VAN DER MERWE and L.E.G. PRICE

 

ABSTRACT: Marlow C.H.B.; Van Tonder E.M.; Hayward F.C.; Van der Merwe S.S; Price L.E.G. A report on the consumption, composition and nutritional adequacy of a mixture of lush green perennial ryegrass (Lolium perenne) and cocksfoot (Dactylis glomerata) fed ad libitum to Thoroughbred mares. Journal of the South African Veterinary Association (1983) 54 No.3, 155-157 (En). 21 Cypress Street, P.O. Box 138, 5880 Cradock, Republic of South Africa.

Non-pregnant Thoroughbred mares were stabled and subjected to 2 trials, each 24 h in duration, to establish their total consumption of a mixture of freshly cut, lush green perennial ryegrass (Lolium perenne) and cocksfoot (Dactylis glomerata) in approximately equal proportions; and to compare the total intake of crude protein, calcium, phosphorus and mass of the grass mixture on a dry matter basis with their daily nutritional requirements. The body mass of each mare was calculated at the commencement of each trial. In the first trial 2 lactating mares with foals at foot, 65 days and 8 days of age, and one mature non-lactating mare, consumed 75,5 kg, 61,0 kg and 39,5 kg of the grass mixture, cut in the early vegetative stage, respectively. The perennial ryegrass (L. perenne) contained 79,63 % moisture, 1,67 % crude protein, 0,75 % calcium, 0,057 % phosphorus and 20,37 % dry matter. The cocksfoot (D. glomerata) contained 79,52 % moisture, 2,27 % crude protein, 0,051 % calcium, 0,061 % phosphorus and 20,48 % dry matter. The younger foal did not eat the grass mixture. The mass of grass mixture consumed by the older foal was not determined. In the second trial conducted 3 weeks later, when oat straw (A vena sativa) was also fed ad libitum, the same lactating mares, but a different mature non-lactating mare, consumed 54,5 kg, 56,0 kg and 40,5 kg of the grass mixture, cut in the mid bloom stage, respectively. The perennial ryegrass (L. perenne) contained 70,03 % moisture, 2,37 % crude protein, 0,086 % calcium, 0,068 % phosphorus and 29,97 % dry matter. The cocksfoot (D. glomerata) contained 71,18 % moisture, 2,51 % crude protein, 0,069 % calcium, 0,089 % phosphorus and 28,82 % dry matter. Oat straw (A. sativa) was consumed by both the lactating mares but not by the non-lactating mare. Both foals consumed an undetermined mass of grass mixture and oat straw. In both trials the grass mixture consumed failed to meet the daily nutritional requirements of the lactating mares for maintenance and production in respect of crude protein and calcium. In both trials the grass mixture consumed by the non-lactating mares met their daily nutritional requirements for maintenance in respect of crude protein, calcium, phosphorus and total feed on a dry matter basis.

 

Key words: Lush green grass, composition, Thoroughbred mares, consumption, nutritional adequacy.

 

 

Published

Journal of the South African veterinary Association Vol 54(3), 1983