Maternal exposure to estrogenic xenobiotics or phthalates has been implicated in the distortion of early male reproductive development, referred to in humans as the testicular dysgenesis syndrome. It is not known, however, whether such early gestational and/or lactational exposure can influence the later adult-type Leydig cell phenotype. In this study, Sprague-Dawley rats were exposed to dibuty...

The Amsterdam-Zaandam cohort has been studied intermittently since 1987. The cohort was selected for optimal pregnancy and birth, in whom prenatal, lactational and more recently current dioxin exposures were measured. In the perinatal period and during the years thereafter, effects on various organ systems have been documented: thyroid, metabolism, immunity, haematology, motor development, brai...

It has been proposed that the performance of lactating animals is limited by the capacity of the female to dissipate body heat - the heat dissipation limit (HDL) theory. This theory predicts that milk production might be constrained not by intrinsic properties of the mammary glands but rather by competitive heat production such as thermogenesis in brown adipose tissue (BAT). To test this predic...

Asparagopsis taxiformis (AT) is a source of multiple halogenated compounds and, in limited number studies, has been shown to decrease enteric CH4 emission vitro and vivo. Similarly, oregano suggested as potential mitigating agent. This study consisted 2 vivo experiments. Experiment (Exp.) 1 was aimed at establishing the effect AT on vitro. Two experiments (Exp. 3) with lactating dairy cows were...

The objective of this experiment was to investigate the effects an essential oil (EO) blend on lactational performance, rumen fermentation, nutrient utilization, blood variables, enteric methane emissions and manure greenhouse gas-emitting potential in dairy cows. A randomized complete block design conducted with 26 primiparous 22 multiparous Holstein 2-wk covariate a adaptation periods precede...

The objectives of this study were: 1) to determine the effect of providing additional prepartum concentrate on the occurrence and severity of ruminal acidosis (RA) and lactational performance during the periparturient period in primiparous cows; and 2) to characterize the occurrence and severity of RA during the periparturient period. We hypothesized that providing additional concentrate prepar...