Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
Influence of different levels of metabolizable protein in ration on digestibility and assimilation of nutrients in intensively growing bulls of Holmogor breed
Kharitonov E.L., Berezin A.S
Institute of Animal Physiology, Biochemistry and Nutrition, Borovsk Kaluga oblast,
Russian Federation
- Номер: 1
- Страницы: 92-101
Журнал: Problemy biologii productivnykh zhivotnykh - Problems of Productive Animal Biology
Аннотация:
ABSTRACT. The aim was to study the fermentation processes in rumen, digestibility and assimilation of nutritional substances in intensively growing calves, depending on the level of metabolizable protein (sum of digestible nondegradable feed protein and digestible microbial protein) in ration. The trial was performed by method of grups/periods (I-IV) according to Latin square scheme on young bulls of Kholmogor breed with an average live weight during the 3-month experience of 204 kg and the average weight gain 1300 g. Levels of metabolizable energy (ME) in all periods were similar (60.9 MJ), the content of crude protein (SP) was sequentially increased from 846 to 1002 g by the use of feed protein additives. Protein degradability in periods was 72.2 (I), 72.7 (II), 70.0 (III) and 69.1% (IV), metabolizable protein levels were 478, 491, 513, 526 g for the periods I- IV respectively. At the end of each period, balance measurements were performed to account for feed intake, urine output, feces, the animals weighed and determined indicators of microbial processes in the rumen (pH, VFA, ammonia, the quantity of bacteria, ciliates, amylolytic and cellulolytic activity) and nutrients digestibility. Samples of rumen content were obtained before and after feeding using an esophageal probe. Protein feed supplements had no significant effect on the enzymatic and microbiological processes in the rumen and intestinal digestion of other components of the ration, with exception of protein; its digestibility increased, resulting in increased supply to the body of metabolizable protein. Alterations in the level of metabolizable protein in the diets from 7.8 to 8.6 g/MJ ME accompanied by increased daily deposition of nitrogen from 41.9 to 58.2 g (P<0.05) while maintaining a high efficiency of its use. Thus, the increase in metabolizable protein to 8.4-8.6 g/MJ ME has a positive effect on the efficiency of feed nitrogen assimilation in intensively growing calves of Kholmogor breed.
Литература:
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