Management strategies to improve cow-calf productivity on meadow bromegrass pastures

Abstract

. 2004. Management strategies to improve cow-calf productivity on meadow bromegrass pastures. Can. J. Anim. Sci. 84: 529-535. A 4-yr experiment was conducted to determine the effects of fertilization, incorporation of a legume and use of the Rumensin ® -controlled release capsules (CRC) on productivity of cow-calf pairs grazing meadow bromegrass (Bromus biebersteinii Roem & Schult.). Four pasture treatments (T), alfalfa-grass fertilized (AF), alfalfa-grass unfertilized (AU), grass-only fertilized (GF) and grass-only unfertilized (GU), each replicated twice were compared. The eight 3.7-ha pastures were split into five equally sized paddocks and rotationally stocked with first-calf cows in 1995 and 1998, and with mature cows in 1996 and 1997. Half of the cows on each pasture received a Rumensin ® CRC 1 wk prior to the start of the pasture season. Cow DMI was not influenced by fertilization or incorporation of a legume. However, cows treated with monensin consumed less (2.3% BW) compared to the control cows (2.5% BW, P < 0.05). Incorporation of alfalfa and fertilization improved pasture quality and resulted in higher CP and lower NDF content in forage selected by the animals. Monensin improved (P < 0.05) cow average daily gain (ADG, kg d -1 ) when grazing unfertilized grass and alfalfa-grass pastures, but did not influence gains of cows on fertilized pastures. Fertilizer application, legume incorporation and monensin administration did not affect milk yield or milk composition. Despite differences in diet quality, calf ADG for AU, AF, and GF were similar. However, calf ADG was lower for GU pastures (P < 0.05), probably as a result of the high fibre and low protein content of this pasture treatment. Both incorporation of alfalfa and fertilization increased total calf gain (kg ha -1 ); the greatest improvement was associated with fertilization. There were, however, economic advantages to legume incorporation, as the cost of the additional gain for GF and AF pastures averaged $1.08 and $0.79 kg -1 ha -1 , and no extra costs were incurred for AU. ). Pour cela, ils ont comparé quatre traitements étudiés en double : la graminée et de la luzerne avec fertilisation (AF), la graminée et de la luzerne sans fertilisation (AU), la graminée avec fertilisation (GF) et la graminée sans fertilisation (GU). Les huit pâturages de 3,7 hectares ont été scindés en cinq enclos de superficie identique et on y a mis à l'herbe, en rotation, des vaches primipares (1995 et 1998) ou des vaches matures (1996 et 1997). La moitié des sujets de chaque enclos a reçu des capsules de Rumensin ® à libéra-tion lente une semaine avant que débute la paissance. La fertilisation et l'incorporation d'une légumineuse n'affectent pas l'ingestion de matière sèche par la vache. Toutefois, les animaux recevant du monensin mangent moins (2,3 % du poids corporel) que les vaches témoins (2,5 % du poids corporel, P < 0,05). L'incorporation de luzerne et la fertilisation améliorent la qualité du pâturage tout en augmentant la concentration de protéines brutes et en ...

Utilization of fortified cubes to deliver trace minerals and monensin in forage-based diets

“…This was attributed to the fact that calves consumed some of the monensin supplemented to their dams on pasture. Recent work completed by Kopp et al (2004) shows that milk yield and milk composition are not affected by monensin supplementation of lactating beef cows.…”