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Wpływ dodatku karotenów naturalnych lub syntetycznego beta-karotenu do dawki pokarmowej na zawartość beta-karotenu i witaminy A w osoczu krwi i płodność krów

100%

Iwanska S., Lewicki C., Minakowski D., Glazer T., Markiewicz E., Wysocka Z.

Zeszyty Problemowe Postępów Nauk Rolniczych

1989

tom 360

The study was carried out on 24 cows and 20 heifers of the black-and-white breed in conditions of commercial production. The animals before calving were assigned randomly to 4 groups. Each group had 2 subgroups of 6 multiparous cows (A) and 5 heifers (B). The control group (I) did not receive any additional carotene or vitamin A. Cows in group II were given additional 300 mg of synthetic β-carotene (Rovimix-Rache) daily during 10 days before and 60 days after the delivery. In group III dried carrots were given in the same period, the rations being equivalent to 300 mg of β-carotene. In group IV vitamin A (1.800.00 i.w) was injected three times (10 days before the delivery, and 7 - 10 and 30 days after the delivery), so as to equlize the addition of β-arotene in groups II and III. Cows of all groups were fed similarly. During winter corn silage (30 kg), pellets (5 kg), sugar beet pulp (0.5 - 3 kg) and a concentrate were used. In summer zero-grazing (grass mixture) was used (60 kg) together with an addition of dried green forage (1 kg). Addition of β-carotene to the ration, both as regards synthetic carotene (Rovomix-Roche) and dried carrots, alleviated carotene and vitamin A deficiency in blood plasma during the first two months after delivery. The effect of vitamin A injections on the level of this vitamin in blood plasma was negligible. Carotene addition to the ratipn affected also the dynamics of β-carotene and vitamin A passing to milk in the first 100 days of lactation. The best indices of fecundity were obtained for cous receiving rations supplemented with synthetic carotene. Influence of β-carotene supply in the ration on fertility of first calving cows (B) has not been clarified. Good results of fertility were found for first calving cous reciving vitamin A injection.

Ograniczanie wyników

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Glazer T.

1 Iwanska S.

1 Lewicki C.

1 Markiewicz E.

1 Minakowski D.

1 Wysocka Z.

1 1989

Wyniki wyszukiwania

Wpływ dodatku karotenów naturalnych lub syntetycznego beta-karotenu do dawki pokarmowej na zawartość beta-karotenu i witaminy A w osoczu krwi i płodność krów