A modernização da agricultura e o conceito de módulo rural

O presente artigo tem por objetivo problematizar o uso, na atualidade, de parâmetros e conceitos construídos na primeira metade da década de 1960, a partir de um perfil da agropecuária brasileira bastante distinto do atual. Nesse sentido, coloca em discussão o conceito de módulo rural, presente no Estatuto da Terra e, pelo estudo de caso de município paulista, onde a agricultura se encontra altamente capitalizada, procura colocar em evidência a perda de poder explicativo do conceito e o anacronismo dos parâmetros que o tomam por suporte.

Utilização de gonadotropina coriônica equina em protocolos de inseminação artificial em tempo fixo em bovinos de corte

Current cattlemen must seek methods to maximum reproductive efficiency of their beef herds, making the business competitive and enhancing greater profitability. For the cow-calf producers, efficiency translates into more cows producing one calf every year. Fixed-time artificial insemination (TAI) is one of several technologies that producers utilize to reach this goal. Postpartum anestrus is one of the biggest obstacles to overcome in order to obtain suitable results at the end of the breeding season. The TAI protocols are efficient in re-establishing cyclicity in noncycling cows during the postpartum period, streamlining the use of labor on farms, allowing the use of artificial insemination (AI) on a large scale, and introducing superior genetics to the herd. The protocols that are most commonly used in Brazil are based on progesterone (P4) releasing devices that prevent premature estrus and ovulation; and estradiol (E2) to synchronize the initiation of a new follicular wave. In such protocols, administration of equine chorionic gonadotropin (eCG) helps the development of the follicle, increases ovulation rate, improves the endocrine and uterine environment during proestrus and diestrus, and improves fertility. The use of eCG in TAI protocols for suckled cows, non-lactating cows and heifers increases the pregnancy rate allowing more calves at the end of the breeding season and higher profitability to the cattlemen