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Transfer of Aflatoxin B1 from Feed to Milk and from Milk to Curd and Whey in Dairy Sheep Fed Artificially Contaminated Concentrates

¹ Dipartimento di Scienze Zootecniche, Università degli Studi di Sassari, Via De Nicola 9, 07100 Sassari, Italy
² Dipartimento Farmaco Chimico Tossicologico, Università degli Studi di Sassari, Via Muroni 23/A, 07100 Sassari, Italy
³ Istituto di Scienze delle Produzioni Alimentari CNR, Via Amendola, 122/o 70126 Bari, Italy
⁴ Istituto Zooprofilattico Sperimentale della Sardegna, Via Duca degli Abruzzi 8, 07100 Sassari, Italy

Corresponding author: G. Pulina; e-mail: gpulina{at}uniss.it.

An experiment was carried out using dairy ewes to study the transfer of aflatoxin B1 (AFB1) from feed to milk and from milk to cheese. The effects of AFB1 on liver function and hematological parameters were also investigated. Fifteen ewes were assigned to treatments in replicated 3 x 3 Latin squares. The experimental groups received 32, 64, or 128 µg/d of pure AFB1 for 7 d followed by 5 d of clearance. On the sixth day of the first period, the total daily milk produced by each ewe was collected separately and processed into cheese. The results indicate that the level of AFB1 used did not adversely affect animal health and milk production traits. The aflatoxin M1 (AFM1) concentrations in milk approached a steady-state condition in all treated groups between 2 and 7 d after the start of treatment. The mean AFM1 concentrations of treated groups in steady-state condition (184.4, 324.7, and 596.9 ng/kg in ewes fed 32, 64, or 128 µg of AFB1, respectively) were significantly affected by the AFB1 doses. The AFM1 concentration was linearly related to the AFB1 intake/ kg of BW. The carry-over values of AFB1 from feed into AFM1 in milk (0.26 to 0.33%) were not influenced by the AFB1 doses. The AFM1 concentrations in curd and whey were linearly related to the AFM1 concentrations in the unprocessed milk.

Key Words: aflatoxin • dairy sheep • carry-over • milk

Abbreviation key: AFB1 = aflatoxin B1, AFM1 = aflatoxin M1.

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