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Effect of prolonged high-concentrate feeding on ruminal protozoa concentrations

Franzolin, R ; Dehority, B. A

Journal of animal science, 1996-11, Vol.74 (11), p.2803-2809 [Periódico revisado por pares]

Savoy, IL: Am Soc Animal Sci

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Título:
Effect of prolonged high-concentrate feeding on ruminal protozoa concentrations
Autor: Franzolin, R ; Dehority, B. A
Assuntos: aliment concentre pour animaux ; aliment pour animaux ; alimentacion ad libitum ; alimentation a satiete ; Animals ; Biological and medical sciences ; boeuf ; buey ; bullocks ; Cattle ; concentrates ; Diet ; Diet - veterinary ; Eating - physiology ; Eukaryota - isolation & purification ; feeds ; Fundamental and applied biological sciences. Psychology ; Hydrogen-Ion Concentration ; mais ; maiz ; maize ; Male ; microorganisme du rumen ; microorganismos del rumen ; piensos ; piensos concentrados ; Protozoa ; Random Allocation ; rumen ; Rumen - parasitology ; Rumen - physiology ; rumen microorganisms ; Stomach ; unrestricted feeding ; Vertebrates: digestive system
É parte de: Journal of animal science, 1996-11, Vol.74 (11), p.2803-2809
Notas: L
L50
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Descrição: Five ruminally cannulated steers, with ad libitum access to feed, were gradually adapted from an all-forage diet to a 75% concentrate diet over a 6-wk period. Three animals were then randomly assigned to an all-concentrate diet (87% whole corn) and the other two were fed a 90% concentrate plus 10% forage diet. These diets were fed for 17 wk and then reversed between groups for 11 additional weeks. Over the last 22 wk, addition of 10% forage to the all-concentrate diet had no effect on the concentration of total protozoa; however, Isotricha and Epidinium percentages increased (P < 0.05). Although concentrations varied markedly, protozoa persisted throughout the entire period of high-concentrate feeding (both diets) in three of the animals. In contrast, the other two animals were defaunated most of the time, except for the sporadic appearance of Entodinium species for 1- or 2-wk intervals. Average pH in these latter two animals was lower (P < 0.05) during the entire 28-wk high-concentrate feeding period. Because these two animals had a lower ruminal pH than the other three, even when fed all forage, it seems that the ruminal environment varies between individual animals. Thus, the maintenance of a protozoal population in animals fed high-concentrate diets may be related to physiological conditions such as rate and extent of salivary production, rate of fluid and particulate matter passage within each animal, and so on.
Editor: Savoy, IL: Am Soc Animal Sci
Idioma: Inglês

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Effect of prolonged high-concentrate feeding on ruminal protozoa concentrations

Franzolin, R ; Dehority, B. A

Savoy, IL: Am Soc Animal Sci

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