Salivary and Ruminal Characteristics, Respiration Rate and EKG Patterns of Steers fed a Pelleted or Ground Roughage Diet at two Levels of intake

The influence of various physical forms of the feed on energy utilisation was comparatively investigated in a total of 170 experiments with the complete metabolism and 28 digestibility experiments with fullgrown sheep. The roughage feedstuffs dried green fodder of vetch/grass, lucerne and rye grass and straw were fed in 9 rations with different quotas of concentrates (0 to 60%) to 4 parallel animals. The roughage underwent the following 5 methods of mechanical treatment: 1) chopping; 2) chopping and pelleting; 3)grinding; 4) grinding and pelleting; 5) chopping and pelleting with concentrates. On the whole, no significant influence of the different methods of mechanical treatment on rumen on the basis of the characteristic data acetic acid, propionic acid, butyric acid, acid total, pH-value and NH3-content during the course of the day (sampling 2.5 to 3, 4 to 4.5, 5.5 to 6, 7 to 7.5, 15.5 to 16 hours after feeding). On an average of the 9 rations the rumen fluid sampled 2.5 to 3 hours after feeding merely showed a growing tendency of the quota of acetic acid and a corresponding decrease of the quota of propionic acid according to the degree of fineness of the roughage.

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Einfluß verschiedener physikalischer Formen des Futters auf den Energieumsatz bei Wiederkäuern

Wittenburg

Jentsch

Schiemann

1980

Archiv für Tierernaehrung

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Eating and Resting Salivation in Early Lactation Dairy Cows

Cassida

Stokes

1986

Journal of Dairy Science

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Salivation rates were measured by cardial collection in four ruminally fistulated, early lactation cows. Complete diets of 70% concentrate: 30% hay crop silage (dry matter) or an isonitrogenous, isocaloric mixture of 60% concentrate: 40% corn silage were fed ad libitum once daily in a replicated 2 X 2 Latin square design. Thirty-day periods, beginning 2 d postpartum, consisted of 22 d adaptation and 8 d for determination of eating behavior, eating and resting salivation rates, and rumen liquid turnover rate. Diet did not affect eating behavior, salivation rates, saliva volumes produced while eating or resting, or saliva composition, but degree of feed ensalivation (fresh basis) and volume of saliva per bolus were higher for the hay crop silage diet due to its higher dry matter content. Resting salivation rate and volume produced while resting were greater at wk 8 than wk 4 of lactation even when corrected to constant dry matter intake, indicating that adaptation to diet postpartum involved increased basal resting salivation rate. Rumen pH was lower for the hay crop silage diet, but rumen fluid kinetic measurements did not differ with diet or week of lactation.

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Dietary Buffering Requirements of the Lactating Dairy Cow: A Review

Erdman

1988

Journal of Dairy Science

306

191

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Salivary and Ruminal Characteristics, Respiration Rate and EKG Patterns of Steers fed a Pelleted or Ground Roughage Diet at two Levels of intake

Cited by 3 publications

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Einfluß verschiedener physikalischer Formen des Futters auf den Energieumsatz bei Wiederkäuern

Einfluß verschiedener physikalischer Formen des Futters auf den Energieumsatz bei Wiederkäuern

Eating and Resting Salivation in Early Lactation Dairy Cows

Dietary Buffering Requirements of the Lactating Dairy Cow: A Review

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