Veterinarija ir Zootechnika

This study aimed to evaluate the economic benefits of using the in-line milk analyzer “Brolis HerdLine” (Brolis Sensor Technology, Vilnius, Lithuania) for the early detection of negative energy balance (NEB) and to assess the value of preventive treatment in dairy cows at high risk of NEB. A total of 52 Holstein cows were selected and paired based on lactation number, days in milk, and fat-to-protein ratio. The pairs were randomly allocated into two treatment groups: Control group (CON, n = 26) and Test group (TE, n = 26). Cows in the TE group received a single 32.4 g monensin (Kexxtone®) controlled-release capsule, while CON cows received no treatment. Milk composition was monitored using the in-line analyzer, and energy-corrected milk (ECM) was used to evaluate performance. Over a 200-day period, the TE group produced 9,916 kg more ECM than the CON group, resulting in an additional €3,056 profit after subtracting treatment costs. On day 20 post-treatment, TE cows showed significantly higher lactose levels (4.64%) than CON cows (p = 0.03). The successful insemination rate was 8.11% higher in the CON group. These results imply that early intervention through the use of an in-line milk analyzer to identify cows at high risk of NEB improves economic performance. The study emphasizes how milk analyzers can be used to make decisions in real time when managing dairy herds.

The objective of this study was to analyze the effects of season of birth, physiological

Five hundred broilers chickens were used to study the effect of quantitative feed restriction during the growth period on the zootechnical performance and economical efficiency. Chickens were raised collectively during the starter period and a part of the growing period. At 24days of age, chickens were divided into three groups: control group, fed ad libitum, and two experimental groups (R1 and R2) restricted, respectively, to 10% and 20% of the daily feed intake of the control between 32 and 42 days of age. At 43 days, chickens of R1 and R2 were re-fed ad libitum until the end of the raising (49 days) where 13 randomly selected chickens from each group were slaughtered to record the weight of the heat carcass. Results showed that the average final live weight and the average heat carcass weight were