This study aimed to evaluate the effects of tannin extract and n-3 fatty acid supplementation on nutrient digestibility, ruminal parameters, blood metabolites, and enzyme activity in lactating ewes. Thirty-six lactating ewes were allocated to 6 experimental groups. The dietary treatments were as follows: 1) control, 2) diet supplemented with 2% dry matter (DM) oak leaf tannin extract, 3) diet supplemented with 2% DM grape pomace tannin extract, 4) diet supplemented with 2% DM linseed oil, 5) diet supplemented with 2% DM oak leaf tannin extract and 2% DM linseed oil, and 6) diet supplemented with 2% DM grape pomace tannin extract and 2% DM linseed oil. The results showed the significant effects of treatments on final body weight, digestibility, and some blood metabolites (P < 0.05). Therefore, the treatment groups had higher final body weight, better nutrient digestibility, and higher values of blood parameters. In conclusion, our results showed that the dietary tannin extract and the n-3 fatty acid source improved nutrient digestibility and blood metabolites, and they had a trend of improving the ruminal volatile fatty acid profile while not having any adverse effects on the animals' performance.
Grape pomace, linseed oil, oak leaves, lactating ewe
YONJALLI, ROGHAYEH VALIZADEH; AGHJEHGHESHLAGH, FARZAD MIRZAEI; MAHDAVI, ALI; NAVIDSHAD, BAHMAN; and STAJI, HAMID
"The effect of tannin extract and n-3 fatty acid source on nutrient digestibility, blood metabolites, enzyme activity, and ruminal parameters of lactating ewes,"
Turkish Journal of Veterinary & Animal Sciences: Vol. 43:
6, Article 3.
Available at: https://journals.tubitak.gov.tr/veterinary/vol43/iss6/3