Effects of the investigational methane (CH 4 ) inhibitor 3-nitrooxypropanol (3-NOP) on animal performance, health and enteric CH production beef cattle were evaluated in a commercial feedlot. Two concurrent studies conducted: large pen study (4,048 cattle, eight replicates per experimental group) to measure performance small (a subset 50 from study, n = 25 emissions. Within animals (body weight...

The effects of initial live weight (LW; 18 and 30 kg), maturity (40 and 65% mature LW) and genotype on dry matter intake (DMI), LW gain (LWG), organic matter digestibility (OMD), rumen outflow rate of solid phase and urinary allantoin-N excretion were examined in 14 and 21 female lambs from the local breed Churra da Terra Quente (CH) and Ile-de-France (IF), respectively. LW at 40 and 65% maturi...

Laboratoire de production animale, Institut National Agronomique de Tunisie, département de production animale, 1082 Tunisie *Corresponding author, e-mail: [email protected] ABSTRACT: The aim of this study is to evaluate the effects of heat stress using temperature-humidity index (THI). Two experiments were conducted using lactating Friesian-Holstein cows to measure the effects of heat str...

In this study, the effects of rumen-protected fat (RPF) were evaluated as an energy source for partial replacement grain feed in diets Merino male lambs during hot season. Fourteen six months old weighing average 29.59 kg randomly allocated into two groups: control diet (CON) and supplemented with 30 g/kg RPF. Live weight (LW), dry matter intake (DMI) daily gain (ADG) recorded, conversion ratio...

Four breed types with 12 cows/breed-type (Hereford x Angus, AHx; Charolais and Angus and Charolais x Hereford, Cx; Jersey x Angus, Jersey x Hereford, Jx and Simmental x Angus, Simmental x Hereford, Sx) were used to estimate nutrient requirements for zero daily weight change. Four nonpregnant, nonlactating cows of each breed type were assigned to one of three feeding levels [90 kcal metabolizabl...

The objective of this study was to determine the effect of a rumen-protected fish oil supplement on the production and reproduction variables in postpartum dairy cows. Holstein cows (n=46) were given a basal total mixed diet plus one PUFA supplement: n-3 (n-3; protected fish oil; 1% dry matter intake (DMI); n=23) or control (n-6; toasted soybeans; 1.8% DMI; n=23), in a switchback design over tw...

One of the primary objectives of dairy producers is to promote dry matter intake (DMI) to support milk production. Considerable research to date has focused on improving the DMI of lactating dairy cows by changing the nutrient composition of feeds. However, the DMI of group-housed lactating dairy cows is also affected by feeding behavior, which is modulated by the environment, management, healt...

An important component of digestive physiology involves ingesta mean retention time (MRT), which describes the time available for digestion. At least three different variables have been proposed to influence MRT in herbivorous mammals: body mass, diet type, and food intake (dry matter intake, DMI). To investigate which of these parameters influences MRT in primates, we collated data for 19 spec...

The effect of soybean oil supplementation in the diet early lactating Girolando cows under moderate heat stress were studied a grazing trial. Dry matter intake (DMI), milk yield, feed efficiency, and behavior (during daytime nighttime) evaluated two groups eight crossbred (Holstein × Gyr) palisade grass (Urochloa brizantha syn. Brachiaria brizantha) with initial means 53±33 days lactation 22.6±...