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Protein reserves and food restrictions in cattle; influence on weight development

, : Protein reserves and food restrictions in cattle; influence on weight development. J Ann Med Vet 111(2): 84-103

During 2 5 months periods, a dry cow placed on a selfacting bascule received rations of the same composition, supplying approximately 1.3 and 0.65 times the maintenance energy requirements. No orderly modification appears in the digestibility of the ration elements. During the liberal feeding period, the urinary N eliminations increase, the N balance is falling and tends to zero and the NBO strongly enlarge. For the whole period, the animal fixes about 20 kg proteins. On the restriction of the ration 1% of the total body protein is eliminated during the 1st 5 days; afterwards the urinary eliminations fall and the balance, from negative, tends to equilibrium; the NBO diminishes. For the whole period, 4 to 5 kg proteins are lost. During the 1st 5 days, the liberal ration induces a weight gain of 36 kg; afterwards the daily gain is 326 g.; at the period end, a saturation appears in body weight. The passage to the 2nd ration induces a loss of 24 kg in 4 days; afterwards the daily loss is 348 g.


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