Graduate Thesis Or Dissertation

 

Effects of two forms of intrareticular selenium supplements on beef cow selenium status and on the transfer of selenium from dam to offspring Public Deposited

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  • Two concurrent studies were conducted to evaluate the effect of selenium (Se) supplementation on beef cows. Trial 1 was designed to evaluate the safety and efficacy of two intrareticular Se supplementation delivery systems. Trial 2 was designed to evaluate the transfer of Se across the placenta and through the colostrum in beef cows. One hundred fifty, selenium (Se) deficient, pregnant crossbred beef cows were assigned to 1 of 4 treatment groups: group A, negative control; group B, 1 Dura-Se bolus at 0 and 119 d; group C, 1 Dura-se at 0 d; and group D, 2 Permasel pellets at 0 d. Cattle were maintained on selenium deficient pastures or forages prepared from these pastures. Blood samples were collected from cows before treatment administration (0 time) and thereafter at 28, 52, 119, and 220 d. Calves from cows selected for data collection above were sampled at birth. Blood samples were collected from calves, prior to suckling, and were analyzed for whole blood selenium (WBSe) concentration. Colostrum samples were collected from dams and analyzed for total Se concentration. Additional samples were collected from calves 24-48 hours post suckling and analyzed for WBSe concentration and serum creatine kinase (CK) level. Weight and health data were recorded on all cows at each blood collection date. Birth weight, sex, and health were recorded on all calves at parturition. Whole blood selenium concentration of cows from all supplemented groups were significantly higher (P<.001) than controls at all sample dates after treatments began. By the end of the 220 d study, treatment group B attained significantly higher (P<.001) WBSe concentrations than any other group. Calves from all Se treated groups had significantly (P<.001) higher WBSe concentrations, both pre- and post-suckling, than controls. Post-suckle WBSe concentration of calves were not significantly (P>.05) different than pre-suckle concentrations in any of the groups. Colostrum selenium concentration from Se supplemented cows were significantly (P.001) higher than from control cows. No difference (P>.05) was determined in plasma CK activities or birth weights between groups of calves. Seven animals died, two of which showed signs of Se deficiency. Necropsy of 5 calves provided no evidence linking these deaths to selenium treatments. No differences (P>.05) in mortality between groups were determined.
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