Different measures of energetic efficiency and their phenotypic relationships with growth, feed intake, and ultrasound and carcass merit in hybrid cattle.

Residual feed intake (RFI) has been proposed as an index for determining beef cattle energetic efficiency. Although the relationship of RFI with feed conversion ratio (FCR) is well established, little is known about how RFI compares to other measures of efficiency. This study examined the phenotypic relationships among different measures of energetic efficiency with growth, feed intake, and ultrasound and carcass merit of hybrid cattle (n = 150).

Prevalence of genital disorders in jordanian school boys.

A prospective field study was conducted to determine the prevalence rate of cryptorchidism, hypospadias and other genital disorders in school children in the eastern part of Jordan. A total of 2495 school boys from 10 different schools were examined in May-June, 1995. Standardized examination and classification criteria were used.