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Pomocny raport RW-1

100%

Drzazga K.

Top Agrar Polska

2009

nr 10 Top Bydło

The impact of cow nutrition in the dry period on colostrum quality and immune status of calves

51%

Nowak W. , Mikula R. , Zachwieja A. , Paczynska K. , Pecka E. , Drzazga K. , Slosarz P.

Polish Journal of Veterinary Sciences

2012

tom 15

nr 1

The objective of the study was to evaluate the effect of energy contents in a dry period diets in “7+1” feeding strategy of dry cow including 7 weeks of the dry period (far-off) and 1 week of a close-up period, on colostrum quality and the immune status of calves. Forty Holstein multiparous cows were dried at 56d before the expected date of calving and were assigned to the higher energy diet group (HE; 0.69 UFL/kg DM, NDF 52% DM), or the lower energy diet group (LE; 0.61 UFL/1kg DM, NDF 56% DM). From -7d to the expected calving date up to 21 d of lactation, all cows were fed the same fresh, lactation diet. Samples of colostrum were collected within 2h after parturition and its density, dry matter content and concentrations of immunoglobulins, fat, protein, lactose, urea and somatic cell counts were measured. Calves were weighed 2 h after calving and on the 21d of life. On 3d and 21d of calves’ life blood samples were collected and the concentration of IgG, IgA, IgM, insulin-like growth factor 1 (IGF-1) as well as total protein and albumin concentrations were determined. Treatments had no significant effect on composition of colostrum and serum immunoglobulins and IGF-1 concentration. In both groups the weight of calves at birth was similar, still daily body weight gain during 21 day of rearing period in HE group was higher than in the LE group (P=0.05).

The impact of cow nutrition in the dry period on colostrum quality and immune status of calves

51%

Nowak W. , Mikuła R. , Zachwieja A. , Paczyńska K. , Pecka E. , Drzazga K. , Ślósarz P.

Dietary energy density in the dry period on the metabolic status of lactating cows

43%

Nowak W. , Mikula R. , Pruszynska-Oszmalek E. , Mackowiak P. , Stefanska B. , Kasprowicz-Potocka M. , Frankiewicz A. , Drzazga K.

2013

tom 16

nr 4

The aim of the study was to investigate the effect of different energy concentrations in the isonitrogenous diet fed during the dry period on postpartum health, fertility and blood variables. Forty Holstein multiparous cows were dried 56 days before the expected day of calving and assigned to group (M) with moderate energy concentrations of 0.69 UFL/kg DM or to the low-energy group (L) with energy density of 0.61 UFL/kg DM. From the 7d before the expected day of calving until the 21d of lactation, all the cows were fed the same fresh transition diet (0.82 UFL/kg DM). From the 22d to the 90d of lactation, all the cows received the same highest energy-density lactation diet (0.90 UFL/kg DM). During the dry period the decline of BCS in groups M and L were 0.07 and 0.12 units respectively. The average decrease of BCS from calving to 56 d of lactation were the same in both experimental groups (0.21 BCS). The first-service conception rate tended to be higher in the M group. Insulin-like growth factor-1, glucose, β-hydroxybutyric acid, non-esterified fatty acid, thyroxine serum concentrations prepartum and 3 and 5d postpartum were not significantly affected by the treatment in the dry period.

Dietary energy density in the dry period on the metabolic status of lactating cows

43%

Nowak W. , Mikuła R. , Pruszyńska-Oszmałek E. , Maćkowiak P. , Stefańska B. , Kasprowicz-Potocka M. , Frankiewicz A. , Drzazga K.

nr 4