impacts on profitability of dairies, primarily through its impact on average milk/ cow/ day, but also due to its impact on culling and the number of calves born. Despite improved understanding of the financial impacts of poor reproductive management, reproductive efficiency has been on the decline within the dairy industry for the last 50 years. Consequently, producers have expressed renewed in...

abstract this study was performed to compare the efficiency of 6 microalgae namely dunaliella tertiolecta, tetraselmis suecica, chlorella sp., (green algae), nannochloropsis oculata, spirolina sp.(blue-green algae) cheatocerus sp. (diatoma),  and isochrices sp. (haptophytae) on the growth, survival and reproduction efficacy in artemia urmiana in laboratory conditions. artemia cysts were harvest...

Mungbean (Vigna radiata (L.) Wilczek) or green gram as a dryland grain legume is exposed to varied timings and severity of drought stress, resulting in variability in photoassimilate production. In order to evaluate some physiological responses in one mungbean cultivar to timing and severity of drought stress, a 3-replicate RCBD (randomized complete block design) field experiment was carried ou...

Rainbow trout, oncorhynchus mykiss is one of the most important cold water fishes in Iran. For successful artificial propagation of rainbow trout, the quality and quantity of brooders and sexual materials are key factors. In the present study, we investigated the age-dependent changes of reproductive efficiency. For this purpose, the brooders were divided into age classes and then three age gro...

I MPROVEMENT in reproductive efficiency is one of the important goals with most species of farm or ranch livestock. This is especially true with sheep which seem to offer a great potential in this respect. The part that inheritance plays in reproduction of this species is not well understood. Earlier attempts to determine heritability of this character (Rendel, 1956; Young, Turner and Dolling, ...