The Effect of High and Low Dose Theileria Parva Infection on the Reproductive Function of Boran/Friesian Heifers

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Date
1993
Authors
Young,A.S.
Rowland,A.C.
Watson.E.D.
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Abstract
Two separate experiments were carried out to find the effect of infectlon with low and high doses of Theileria parva sporozoites on the cyclical status of Boran/Friesian cross heifers. In each experiment, ten heifers were infected and another four heifers acted as controls. Routine monitoring of estrous behavior, determination of serum progesterone concentrations and palpat10n of the ovar1es per rectum were used to assess the cyclical status of each animal. Two and eight animals died in the T. parva low (TpL) and h1gh (TpH) dose experiments, respectively. Five of e1ght recovered an1mals 1n the TpL group cycled regularly postinfection, while three others had extended periods of ovarian dysfunct10n postinfection. Both infected and recovered animals in the TpH-group similarly had extended periods of ovarian dysfunction postinfect1on. All controls in both experiments cycled regularly throughout the study period.
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Theriogenology: An International Journal Of Animal Reproduction, 40, p. 977-986
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