Effect of dietary supplementation with zinc-methionine on ruminal enzyme activities, fermentation characteristics, methane production, and nutrient digestibility: An study.

Objective: The principal objective of this research was to examine the influence of zinc-methionine (Zn-Met) addition on feed on the ruminal enzyme activities, fermentation characteristics, methane production, and digestibilities of feed nutrients.

Materials And Methods: The dosage of Zn-Met as a source of organic Zn was added to feed based on dry matter (DM) as follows: 0-without Zn addition (CON), 30 Zn mg/kg-low (LZM), 60 Zn mg/kg-medium (MZM), and 90 Zn mg/kg-high (HZM).

Results: The results indicated significant impacts of Zn-Met addition on various parameters.

Chemical composition and rumen fermentation characteristics of various tropical seaweeds.

Objective: This research aimed to evaluate potential tropical seaweed from Indonesia as an ingredient or supplement feed for ruminants based on chemical composition and rumen fermentation parameters.

Materials And Methods: The seven natural tropical seaweeds (three green and four red species) were collected from Ndrini and Sepanjang Beach, Gunungkidul, Yogyakarta, Indonesia. The experimental design on secondary metabolite profiles used a completely randomized design, and the gas production test used a randomized complete block design with seven seaweed species variances and four replications (blocks) based on rumen fluid collection time.

Milk production, plasma metabolite profiles and mammary arterial-venous differences of milk precursors in early lactation cows milked at different frequencies by an automatic milking system.

The objective of this study was to clarify the effect of different milking frequencies under an automatic milking system (AMS) on milk yield, plasma metabolite profiles and mammary arterial-venous (A-V) differences of milk precursors by mammary tissues in early lactation cows. Twelve Holstein cows were divided into two and four times milking frequency treatments by AMS after calving to 50 days postpartum. Cows were given a partial mixed ration ad libitum and a concentrate diet at every milking.