Effect of feeding additives on total solids of cow's milk
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Date
1992
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Department of Dairy Science, College of Veterinary and Animal Sciences, Mannuthy
Abstract
A study was undertaken to evaluate effect of feeding acetic acid (200 ml/day), sodium bicarbonate (1.5% of the concentrate), potassium carbonate (1.2% of the concentrate) and magnesium oxide (0.8% of the concentrate) on solids content of cow's milk.
An exhaustive review of literature has been presented about the use of these additives in cow ration for modifying milk composition.
Six cross-bred.cows within the stage of 60 to 160 days of lactation with milk fat content of three to four per cent were alloted for feeding each additive.
The feeding was done for 25 days of which first 20 days served as adaptation period. Milk samples were collected during pre-treatment period/ adaptation period, treatment (experimental) period and post-feeding period. Pre treatment period samples served as the control. Milk samples were analysed for fat per cent, protein per cent and total solids per cent. The methods of analysis have been detailed. Solids-not-fat per cent was found out by difference. Daily milk yield (kg/d) of each cow was noted. Fat yield (kg/d) and protein yield (kg/d) were calculated. The feed consumption by animals was recorded. The effect of additives were compared.
Sodium bicarbonate and potassium carbonate significantly increased fat per cent of milk by 0.4 and 0.35 from pre-treatment values respectively. Acetic acid and magnesium oxide produced only non-significant increases in fat per cent which continued during post-feeding period also.
Potassium carbonate feeding increased milk protein per cent significantly by 0-42 from pre-treatment value. Comparison between additives showed that effects produced by potassium carbonate on protein per cent significantly differed from effects produced by acetic acid.
Total solids content was significantly increased by 0.42 per cent on feeding potassium carbonate from pre treatment value. None of the additives produced significant changes in solids-not-fat percentage.
Sodium bicarbonate and potassium carbonate significantly reduced milk yiled by 1.28 kg/d and 0.71 kg/d from the pre-treatment values respectively. This reduction continued during post-feeding period. Non-significant changes in fat yield and protein yield were produced by all the additives except potassium carbonate.
Feed consumption by the animals was not affected by feeding any of the additives
Sodium bicarbonate and potassium carbonate significantly increased milk fat per cent. But their use in the ration is not recommended due to significant reduction in milk yield.
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