Avila Andre S, Zambom Maximiliane A, Faccenda Andressa, Werle Caroline H, Almeida Ana R E, Schneider Cibele R, Grunevald Dieisson G, Faciola Antonio P
Department of Animal Science, State University of Western Parana, Marechal Candido Rondon, PR 85960-000, Brazil.
Department of Animal Science, State University of Maringa, Maringa, PR 87020-900, Brazil.
Animals (Basel). 2020 Apr 11;10(4):662. doi: 10.3390/ani10040662.
The objective of this study was to evaluate the effects of five levels of condensed tannins (CT) from black wattle () in the diets of lactating dairy cows on intake, nutrient digestibility, ruminal microbial protein synthesis, milk production, composition, oxidative profile, and blood metabolites. Five Holstein cows (88 ± 26.8 days in milk) were allocated in a 5 x 5 Latin square design for a period of 20 days (14 days of diet adaptation and six for sampling). Treatments were the inclusion levels of CT at 0, 5, 10, 15 and 20 g/kg of dry matter (DM) in the diet. There was no effect of CT on DM intake. The digestibility of DM and neutral detergent fiber changed quadratically, with the maximum values at 12.2 and 11.4 g/kg of DM, respectively. There was no effect on ruminal microbial protein synthesis and milk production; however, milk casein concentration was reduced linearly. There was no effect on the milk oxidative profile. Inclusion of CT at levels up to 20 g/kg of DM did not affect intake or microbial protein synthesis; however, added CT depressed the production of energy corrected milk and milk casein concentration.
本研究的目的是评估黑荆树中五种缩合单宁（CT）水平对泌乳奶牛日粮的采食量、养分消化率、瘤胃微生物蛋白合成、产奶量、组成、氧化状态和血液代谢物的影响。五头荷斯坦奶牛（产奶88±26.8天）按5×5拉丁方设计分配，为期20天（14天适应日粮，6天采样）。处理方式为日粮中CT的添加水平分别为0、5、10、15和20 g/kg干物质（DM）。CT对干物质采食量没有影响。干物质和中性洗涤纤维的消化率呈二次变化，最大值分别为12.2和11.4 g/kg DM。对瘤胃微生物蛋白合成和产奶量没有影响；然而，乳中酪蛋白浓度呈线性下降。对乳的氧化状态没有影响。日粮中CT添加水平高达20 g/kg DM时不影响采食量或微生物蛋白合成；然而，添加CT会降低能量校正乳的产量和乳中酪蛋白浓度。
