Feeding behaviour and forage nutrient utilization by goats on a semi-arid reconstituted silvipasture

Sharma, Kavita; Saini, Amandeep; Singh, Narinder; Ogra, J. L.

doi:10.5713/ajas.1998.344

Cited by 4 publications

(1 citation statement)

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“…Therefore, resultant of chewing activity facilitates digestion of feed and is subsequently sustainable animal health. Several factors affect the chewing activity of ruminant; NDF content (Beauchemin, 1991), feed particle size and gravity (Woodford and Murphy, 1988), amount of feed intake (Luginbuhl et al, 1989), season (Sharma et al, 1998) and concentrate level (Sudweeks et al, 1975). Although the NRC (1989) recommended 19 to 21% ADF and 25 to 30% NDF in dairy cattle diets, quantitative (fiber concentration in the diet) as well as qualitative (physical form of the fiber) aspects of dietary fiber must be considered to ensure that chewing activity maintains normal ruminal function (Woodford et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Chewing Activities of Selected Roughages and Concentrates by Dairy Steers

Moon¹,

Lee²,

Lee³

2002

Asian Australas. J. Anim. Sci

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To evaluate the chewing activity of ruminant feeds, four Holstein steers (average body weight 742±15 kg) were employed. Experimental feeds were four roughages (NH 3 -treated rice straw, alfalfa hay, corn silage, orchard grass hay) and four concentrate ingredients (cotton seed hull, beet pulp pellet, barley grain, oat grain). Regarding palatability for each experimental feeds which was overviewed during the adjustment period, animals were fed roughages alone, but with 50% NH 3 -treated rice straw (NH 3 -RS) for concentrate ingredients. Therefore, all the data for concentrate ingredients was derived by extracting the result per unit obtained from steers fed NH 3 -RS alone. The experiment was conducted using a 4×4 Latin square designs for roughages and concentrate ingredients. Experimental feeds were fed during a 10 d adaptation and 2 d chewing data collection during each experimental period. Animals were gradually adjusted to the experimental diet. Dry matter intake (DMI) was restricted at a 1.4% of mean body weight (10.4 kg DM/d). Time spent eating and eating chews per kilogram of DMI were greatest for beet pulp pellet, and lowest for barley grain (p<0.05). Time spent rumination per kilogram of DMI was greatest for NH 3 -RS, cotton seed hull and orchard grass, but rumination chews were greatest for cotton seed hull and orchard grass except NH 3 -RS (p<0.05). Roughage index value (chewing time, minute/kg DMI) was 58.0 for cotton seed hull, 56.1 for beet pulp pellet, 55.5 for NH 3 -RS, 53.1 for orchard grass hay, 45.9 for corn silage, 43.0 for alfalfa hay, 30.0 for oat grain, and 10.9 for barley grain. The ratio of rumination time to total chewing time (eating plus ruminating) was about 72% for the roughages except corn silage (66.9%), and followed by cotton seed hull (69.5%), and ranged from 49.5% to 52.9% for other feeds. Higher percentages of rumination in total chewing time may be evidently indicate the characteristics of roughage. Therefore, this indicate that the chewing activity of concentrate ingredients can be more fully reflects by the ruminating time than total chewing time (RVI), although it is reasonable to define the RVI for roughages.

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