Effect of using ammonia treatment and Bentonite supplement to minmize hazards of aflatoxin on crossbred Friesian lactating cows milk production
Abstract: The present study was conducted to examine the ability of raw bentonite, ammonia gas or both together to detoxify a diet of lactating dairy cows naturally contaminated with 200 μg AFB1 / kg DM concentrate feed mixture (CFM) and 40 μg AFB1 / kg AFB1 rice straw (RS) and reduce the metabolites AFM1 in milk.
Thirty crossbred dairy crossbred Friesian multiparous cows in mid-lactation period, weighing 481.25 kg were randomly distributed according to body weight into 5 dietary treatments; (1) aflatoxin-contaminated (control), (2) aflatoxin-contaminated diet with bentonite, (3) ammoniated aflatoxificated concentrate feed mixture CFM+aflatoxificated rice straw RS+bentonite, (4)aflatoxificated CFM+ ammoniated RS and (5) contaminated CFM and ammoniated RS + bentonite. The feeding experiment lasted 90 days, during which cows were fed respective diets according to NRC (1988). Individual live body weight (BW), feed intake (FI) were biweekly recorded and daily milk production, and its composition, feed conversion ratio (FCR) and economical efficiency were calculated. Feeding ammoniated CFM and supplemented with bentonite (Ration4) increased (P<0.01) the digestibility of all nutrients and feeding values. Also, milk yield and fat corrected milk, protein percentages were increased (P<0.05) by feeding the same diet, but no significant effect on fat, total solids and solids not fat percentages. FCR and economical efficiency (P<0.05). Blood serum total proteins, albumin and urea nitrogen values were decreased (P<0.01) by feeding aflatoxificated diets, whereas, no significant differences in globulin and creatinine values. Cows fed diet supplemented with raw bentonite (R3) having the lowest carry- over rate of aflatoxin than cows fed on ammoniated diet (R4). It is concluded that, feeding lactating cows on detoxifiated rations with ammonia (3%) and supplemented with raw bentonite (450 g/h/d) can improve digestibility coefficients, milk production and its composition, decreased the content of AFM1 residue in produced milk and also, decreased carry- over aflatoxin AFM1 from feed to milk to safety levels.
Key words: Aflatoxin, ammonia gas, bentonite, cows, feed contamination, milk.
Publication year 2003
Pages 603-616
Availability location معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
Availability number
Organization Name
serial title Egyptian Journal Nutrition and Feed
ISSN 1110-6360
Author(s) from ARC
Agris Categories Animal feeding
AGROVOC
TERMS		 Aflatoxins. Bentonite. Cows. Milk.
Proposed Agrovoc feed contamination;ammonia gas;
Publication Type Journal
↑