Comparative efficacy of a herbal anthelmintic and piperazine citrate against natural infection of Toxocara vitulorum (Goeze 1982) in cow and buffalo calves* - DEVI, H USHARANI; ANSARI, M Z; SINGH, S K; THAKUR, D K; BIJUBALA DEVI, K H (The Indian Journal of Animal Sciences, 2014)