Evaluation of a Mobile Computerized Grain Feeder for Lactating Cows Grazing Grass Pasture
- 1 December 1997
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 80 (12) , 3271-3282
- https://doi.org/10.3168/jds.s0022-0302(97)76302-1
Abstract
The objective of this study was to evaluate a mobile computerized grain feeder for use to feed individually Holstein cows grazing grass pasture. Thirty-two Holstein cows averaging 95 d of lactation and 39.3 kg/d of milk were rotationally grazed on predominantly Dactylis glomerata pastures for 9 wk starting in early May. Cows were blocked according to parity, days of lactation, and milk yield. Cows were randomly assigned to a control group in which cows were individually fed grain twice daily at milking or to a group that was offered grain four times daily using a mobile grain feeder in the pasture. Cows in both groups were offered 1 kg of grain/3 kg of milk; pasture was the only source of forage. Cows fed using the mobile grain feeder consumed less grain than did control cows (9.3 vs. 11.3 kg/d) and tended to yield less milk, but with a higher fat content. A separate analysis was conducted using data from only those cows that were fed using the mobile grain feeder and that consumed, in four relatively equal amounts, at least 75% of the allotted grain of their respective pairmates (7 per group) in the control group. When cows that were using the mobile grain feeder consumed amounts of grain comparable with that of the controls, more frequent grain feeding did not alter milk yield or composition. Plasma samples (five per cow per treatment) were collected at 2-wk intervals to measure glucose, urea N, and nonesterified fatty acids (NEFA). Plasma glucose and urea N were not affected by treatment and averaged 54.9 and 19.9 mg/ dl for all cows, respectively. Cows fed grain using the mobile feeder had higher (212.4 vs. 170.5 meq/L) concentrations of NEFA than did control cows, but, when cows consumed greater than 75% of their allotted grain from the mobile feeder, concentrations of NEFA were similar. The mobile grain feeder can be used to feed cows individually on pasture; however, adaptation of the cows to the mobile grain feeder appears to be important.Keywords
This publication has 24 references indexed in Scilit:
- Development of a Mobile Solar-powered Dairy Concentrate FeederApplied Engineering in Agriculture, 1995
- Effect of level of concentrate fed once or twice daily on the milk production of cows grazing tropical pastureAustralian Journal of Experimental Agriculture, 1994
- Nonstructural Carbohydrate and Protein Effects on Rumen Fermentation, Nutrient Flow, and Performance of Dairy CowsJournal of Dairy Science, 1993
- Storage of fresh and ensiled forages by freezing affects fibre and crude protein fractionsJournal of the Science of Food and Agriculture, 1992
- In saccodegradation of organic matter and crude protein of fresh grass (Lolium perenne) in the rumen of grazing dairy cowsThe Journal of Agricultural Science, 1991
- Effect of herbage type and level of intake on the release of chromic oxide from intraruminal controlled release capsules in sheepNew Zealand Journal of Agricultural Research, 1989
- Feeding frequency for lactating cows: effects on rumen fermentation and blood metabolites and hormonesBritish Journal of Nutrition, 1986
- Evaluation of a mathematical model of rumen digestion and an in vitro simulation of rumen proteolysis to estimate the rumen-undegraded nitrogen content of feedstuffsBritish Journal of Nutrition, 1983
- Some Comments on C PTechnometrics, 1973
- A TWO‐STAGE TECHNIQUE FOR THE IN VITRO DIGESTION OF FORAGE CROPSGrass and Forage Science, 1963