PRINT ISSN 2285-5718, CD-ROM ISSN 2285-5726, ISSN ONLINE 2286-0126, ISSN-L 2285-5718


Published in AgroLife Scientific Journal, Volume 8, Number 1
Written by Margareta OLTEANU, Mihaela SĂRĂCILĂ, Mariana ROPOTĂ, Raluca Paula TURCU, Dumitru DRĂGOTOIU, Monica Paula MARIN, Elena Narcisa POGURSCHI

The use of dietary natural zeolites in dairy cows diets increased recently, with the purpose of improving animal performance, health state, milk quality and to alleviate the adverse environmental effects. The purpose of our work was to study the effects of the dietary volcanic tuff given to dairy cows, on the feeding quality of the milk. The 100 days feeding trial used 80 Holstein Friesian dairy cows, with an average body weight of 545 kg, assigned to four groups (C, E1, E2, E3). The basal diet (C) was a single mixture of corn silage, alfalfa hay, corn, triticale, soybean meal and brewer’s grains. The experimental diets included additionally three levels of volcanic tuff: 200 g/cow/day (E1); 350 g/cow/day (E2) and 500 g/cow/day (E3). Milk samples were collected in the end of the trial and assayed for the main nutrients. The results showed significantly (P<0.05) higher levels of: conjugated linoleic acid (CLA), 0.21% in group E3, compared to 0.14% total FAME in group C; copper, 0.103 mg/kg in group E3, compared to 0.065 mg/kg in group E1; iron, 1.56 mg/kg in group E3 and 1.44 ± 0.23 mg/kg in group E2, compared to 1.08 mg/kg in group C; zinc, 8.26 mg/kg in group E3, 7.64 mg/kg in group E2 and 6.11 mg/kg in group E1, compared to 3.24 mg/kg in group C. The use of up to 500 g volcanic tuff/dairy cow/day improved the feeding quality of the milk due to the significant (P<0.05) increase of CLA and trace elements: copper, iron, manganese, zinc, which are of major importance in human feeding.

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