Effect of Dietary Chestnut or Quebracho Tannin Supplementation on Microbial Community and Fatty Acid Profile in the Rumen of Dairy Ewes
Table 1
Ingredients, chemical composition, and fatty acids profile of the experimental concentrates and of the hay and rolled barley administered to the ewes.
Grass hay
Rolled barley
Control diet
CHT diet
QUE diet
Ingredients (g kg of DM)
Barley
213.8
213.8
213.8
Corn
211.3
211.3
211.3
Wheat bran
158.5
158.5
158.5
Soybean meal (44 CP)
126.8
126.8
126.8
Beet pulp
89.8
89.8
89.8
Soybean oil1
84.5
84.5
84.5
Bentonite
52.8
-
-
Chestnut tannin extract2
-
52.8
-
Quebracho tannin extract3
-
-
52.8
Molasses
41.3
41.3
41.3
CaCO3
10.6
10.6
10.6
Sodium bicarbonate
5.3
5.3
5.3
Dicalcium phosphate
5.3
5.3
5.3
Chemical composition (g kgof DM)
Organic matter
847.0
859.9
816.9
858.1
869.6
Crude protein
111.2
121.0
165.6
173.7
170.3
Ether extract
12.0
16.1
109.4
105.4
102.4
NDF
636.4
134.1
174.7
181.4
172.1
ADF
501.3
54.2
77.6
72.4
74.3
ADL
105.7
14.9
10.6
13.3
8.7
Ash
69.6
21.0
84.6
39.9
39.4
ME (MJ kg−1 DM)
7.8
9.9
13.1
14.1
14.1
NEl (Mcal kg−1 DM)
0.9
1.2
2.0
2.1
2.1
Fatty acids (g/100 g of total fatty acids)
16:0
35.5
18.2
14.0
14.4
14.9
SA, 18:0
5.8
4.6
3.6
3.4
3.4
18:1 cis9
9.3
21.2
23.3
22.9
22.0
LA, 18:2 cis9 cis12
28.5
45.0
51.4
51.7
51.8
LNA, 18:3 cis9 cis12 cis15
2.8
6.0
5.8
5.6
5.8
Other FA
18.1
4.9
1.9
2.0
2.1
Fatty acid profile of soybean oil (g/100 g of total fatty acids): C16:0, 11.01; C18:0, 3.6; C18:1 cis9, 22.09; C18:2 cis9 and cis12, 53.7; C18:3 cis9, cis12, and cis15, 7.2. Hydrolysable tannins extracted from chestnut wood (Castanea sativa Mill.) containing 750 g of equivalent tannic acid/kg DM (provided by Gruppo Mauro Saviola Srl Radicofani, Siena, Italy). Condensed tannins extracted from quebracho (Schinopsis lorentzii) containing 456 g of equivalent tannic acid/kg DM (provided by Guido Lapi SpA, Castel Franco di Sotto, Pisa, Italy).
