Journal of Dairy Science

Keywords calcium serotonin blood pH transition cow INTERPRETIVE SUMMARY Serotonin has been previously established to influence calcium (Ca) dynamics in dairy cows at various stages of lactation. We demonstrated that using a randomized 2x2 factorial study feeding a negative dietary cation anion difference (DCAD) diet prepartum maintained greater blood serotonin in cows for 102 h prepartum.

Key words training robotic milking personality trait behavior INTERPRETIVE SUMMARY This study investigated the effects of different training methods, and individual dairy cow personality, on their adaptation to an automated milking system (AMS). Cows that were trained using both the mechanics of the AMS (noises, robotic arm) and environment exposure had a higher milk yield compared to cows who were not trained.

FASS specializes in providing services to science-focused organizations, allowing them to function more efficiently as a group than as individual units. FASS promotes education and research by bringing together scientists and educators in animal agriculture and facilitating the dissemination of scientific and technical information to users through publications and scientific meetings.

Keywords dairy calf social housing regrouping competition INTERPRETIVE SUMMARY Given evidence across species of effects of early social experience on behavioral development, we evaluated long-term effects of dairy calf social housing on behavior of pregnant heifers. Upon introduction to a free stall pen, heifers raised in pairs were more active, spent more time feeding and less time in a stall, and had greater competitive success for stall access, compared with heifers raised individually.

Key Words cull cow market cow dairy meat quality meat tenderness INTERPRETIVE SUMMARY: Dairy cows selected for culling were randomized to be either sent direct to slaughter or dried-off and fed a lactating cow TMR for about 60 days to assess the impact of feeding on carcass traits and meat quality. A feeding period for cull dairy cows following drying off from lactation improved dressing percentage, intramuscular fat, and ribeye area.

ABSTRACT Dairy cows experiencing heat stress (HS) during the pre-calving portion of the transition period give birth to smaller calves and produce less milk and milk protein. Supplementation of rumen-protected methionine (RPM) has been shown to modulate protein, energy, and placenta metabolism, making it a potential candidate to ameliorate HS effects. We investigated the effects of supplementing RPM to transition cows under HS induced by electric heat blanket (EHB) on cow-calf performance.

Key words calf feeding strategies nutrient partitioning rational use of antimicrobials rumen development volatile fatty acids INTRODUCTION Waste milk (WM) encompasses colostrum and milk derived from cows undergoing treatment for several ailments, including clinical mastitis, foot and reproductive diseases, and other related conditions (Ma et al., 2022). Additionally, this category further encompasses milk with an elevated SCC, rendering it unsuitable for commercial use (Aust et al., 2013).

Key words dairy disease economic impact INTRODUCTION In 2021, global milk production approached one billion (B) metric tonnes, with over 80% of that production coming from cattle (FAOSTAT, 2023b). Milk is as an important source of nutrients, and nutrient-rich foods such as milk are anticipated to continue playing a key role in global nutrition and food security (Smith et al., 2022), with total global food demand expected to increase by up to 56% between 2010 and 2050 (van Dijk et al., 2021).

ABSTRACT Methane is a potent greenhouse gas produced during the ruminal fermentation and is associated with a loss of feed energy. Therefore, efforts to reduce methane emissions have been ongoing in the last decades. Methane production is highly influenced by factors such as the ruminal microbiome and host genetics.

Key words Salmonella phage magnetic capture recombinase polymerase amplification real-time detection INTRODUCTION Salmonella infection, one of the major foodborne diseases, is an important public health issue particularly in impoverished areas, posing a substantial threat to human health and food safety and increasing the economic burden on society (Chen et al., 2016; Hadler et al., 2020).