Effects of rumen-protective γ-aminobutyric acid additive on lactation performance and serum biochemistry in heat-stressed cows

In the context of global warming, heat stress has become one major factors limiting dairy cattle production. Although many methods have been explored to help cows mitigate negative effects during hot summer months, maintaining performance high-yielding under is still a great challenge. The aim this trial was investigate effect RP-GABA in diet on milk yield, composition and serum biochemical parameters heat-stressed cows. Twenty Chinese Holstein early lactation (51.00 ± 4.92 kg milk/d, 71 10.94 d 2.68 0.73 parities) were included experiment randomly divided into four groups (n = 5/group). experimental consisted control group (0 g RP-GABA/d) three treatment groups, given 5, 7.5 10 RP-GABA/d dry matter (DM) per cow, respectively. results showed that supplementing with g/d improved protein production but had no improvement other performance, alleviation cows, or immune function antioxidant capacity. Ultimately, we conclude supplementation heat-stressed, can provide degree enhancement. Furthermore, our study provides some reference for nutritional measures especially