The objective of this study was to determine if the length of chop of processed corn silage influences the impact of supplemental fat on rumen fermentation and performance of dairy cows. We hypothesized that increasing forage particle length may alleviate the interference of fat on rumen fermentation. Sixteen Holstein cows averaging 120 d in milk were used in a replicated 4 x 4 Latin square des...

I . Lambs fitted with cannulas in the abomasum, terminal ileum and caecum were used to study the digestion of starch and dry matter when rations with high starch content were given. Polyethylene glycol was used as an indigestible reference substance. 2. In Expt I reduction in level of feeding from an estimated ad lib. intake to 70% of this level reduced the amount of dietary starch escaping fer...

The nutrient contents of perennial ryegrass (Lolium perenne L.) and alfalfa (Medicago sativa L.) are reasonably similar. Despite similarities, the lactation performance of dairy cows fed perennial ryegrass has not been compared with the lactation performance of dairy cows fed alfalfa. The present study was implemented to compare the performance of lactating cows fed alfalfa or perennial ryegras...

The objective of this study was to evaluate the best level of inclusion of cactus pear in the ensiling of elephant grass Brazil seeds (BRS) capiaçu (Pennisetum purpureum), its effects on fermentative characteristics; and nutritional value. Experimental treatments consisted of BRS capiaçu grass silage with five levels of inclusion of cactus pear (0, 5, 10, 15 and 20% inclusion as fresh ...

Accepted: 13/06/2016 Abstract A study was undertaken to investigate the effect of supplementing formaldehyde treated rape seed meal on milk production, milk composition and feed conversion efficiency. Dietary supplementation of formaldehyde treated rape seed meal had no significant effect on the dry matter intake of cows from different groups. The average milk yield and 4% FCM yield were signif...

Rumen fill and turnover rates of liquid, grain, and hay in the gastrointestinal tract were measured using rare-earth elements as multiple markers in four rumen fistulated cows during the dry period and throughout lactation. Apparent digestibilities of dry matter, crude protein, neutral-detergent fiber and aciddetergent fiber were also measured. Hay to grain ratios of 82.5:17.5, 45:55, 57:43, an...

The objectives of this research were to describe the feed sorting, feeding behavior, and feed intake of cows consuming a close-up ration and to determine if these behaviors are affected by competition for access to the feed bunk. Thirty-six dry Holstein cows, consuming a close-up total mixed ration diet, were assigned to 1 of 2 treatments: 1) noncompetitive (1 cow/feed bin) or 2) competitive (2...

This study was designed to evaluate dry matter intake (DMI), ruminal fermentation, digesta outflow, omasal flow of N constituents, and total-tract digestibility in response increasing dietary lipid content derived from high-lipid by-product-based pellets for finishing beef cattle. Five ruminally cannulated heifers were used a 5 × Latin square design. Dietary treatments iso-nitrogenous with ethe...

The influence of rumen microbial structure and functions on host physiology remains poorly understood. This study aimed to investigate the interaction between the ruminal microflora and the host by correlating bacterial diversity with fermentation measurements and feed efficiency traits, including dry matter intake, feed conversion ratio, average daily gain, and residual feed intake, using cult...