Effect of exogenous amylase on lactation performance of dairy cows fed a high-starch diet

Abstract

Exogenous amylase supplementation can increase starch and fiber digestibility in lactating dairy cows. We evaluated the effect of exogenous amylase supplementation on diets with high starch concentration (32% of dry matter). Twenty-eight Holstein cows (171 ± 80 d in milk, 4 primiparous) received a standard diet for 14 d and then a treatment for 63 d, in a covariate-adjusted randomized block design with repeated measures over time. Treatments were amylase [0.5 g of Ronozyme RumiStar (DSM Nutritional Products, Basel, Switzerland) per kg of total mixed ration dry matter] or control. The diets contained (% of dry matter): 39.4% corn silage, 11.2% rehydrated and ensiled mature corn grain, and 11.7% finely ground mature corn. Amylase increased milk yield (32.3 vs. 33.0 kg/d) and reduced dry matter intake (20.7 vs. 19.7 kg/d), increasing feed efficiency (1.52 vs. 1.63). Amylase also increased milk lactose synthesis (1.49 vs. 1.56 kg/d) and plasma glucose concentration (59.3 vs. 68.6 mg/dL). Secretions of milk fat and protein did not differ. Although milk urea N did not differ, amylase reduced the concentration of urea N in blood, suggesting an increase in ruminal starch degradation. However, the total-tract apparent digestibility of starch (96.3% of intake) and neutral detergent fiber (44.4% of intake), ruminal fermentation profile, and microbial yield estimated by urinary allantoin excretion did not differ. Cows fed amylase sorted in favor of long feed particles and against short particles, had shorter chewing activity (780 vs. 699 min/d), and had fewer meals per day (11.5 vs. 9.7). Amylase improved the feed efficiency of lactating cows fed a high-starch diet; the enzyme increased milk yield and reduced intake.

Effects of exogenous amylase on the in vitro digestion kinetics of whole‐crop maize silages made from flint or dent grain type at different phenological stages grown in tropical condition

“…Similarly, amylase supplementation increased the total NDF digestibility when evaluated in vivo (Gencoglu et al, 2010;Mccarthy et al, 2013). Contrary to our study, others did not found effect of addition of the exogenous amylase on NDF digestibility for dairy cows (Andreazzi et al, 2018;Zilio et al, 2019).…”

“…Overall, there are no limiting factors for starch digestion in the rumen (Harmon, Yamka, & Elam, 2004 changes can promote improvements in ruminant production. In this context, Andreazzi et al (2018) observed an increase of 0.7 kg/day in milk yield of dairy cows with exogenous amylase. These authors explain this effect most likely due to increase in lactose production by greater glucose availability as consequence of exogenous amylase supplementation.…”

Nutrient digestibility, ruminal fermentation, and milk yield in dairy cows fed a blend of essential oils and amylase

“…Thus, alternative feed additives to MON have been tested to enhance animal performance. Among the currently marketed feed additives, essential oils (EO) and enzyme products have attracted the attention of the scientific community as potential alternatives to ionophores, especially for being considered "generally recognized as safe" and may improve animal performance (Benchaar et al, 2008;Andreazzi et al, 2018). Essential oils are aromatic compounds extracted from plants by fermentation or distillation (Chao et al, 2000) that exhibit antimicrobial properties, promote propionate production in in vitro studies , and may improve milk and FCM production of dairy cows (Kung et al, 2008;Tassoul and Shaver, 2009).…”

“…Although enzymes for ruminants have been studied since the 1960s (as reviewed by Beauchemin and Rode, 1996), researchers have re-evaluated their potential in ruminant nutrition in recent years due to increases in feed costs, decreases in enzyme production costs, and greater availability of more active and defined enzyme preparations (Beauchemin et al, 2003). Indeed, the addition of enzyme products with amylase activity in dairy cow diets has increased diet digestibility and milk production of cows (Tricarico et al, 2005;Gencoglu et al, 2010;Andreazzi et al, 2018). Freire et al (2017) reported greater FCM production in cross-breed dairy cows fed EO combined with amylase (EOA) compared with cows fed MON (22.7 and 22.0 kg/d,respectively).…”

Düşük Nişastalı Rasyonlarla Beslenen Geçiş Dönemindeki İneklerde Amilaz Enziminin Etkisi: 2. Toplam Sindirilebilirlik ve Kan Üre Azotu

“…There are studies in which some feed additives [8][9][10] and treatments [11] was used for transition dairy cows. In addition, exogenous amylase was evaluated in some trials to improve performance [12][13][14] and digestibility [15,16] . The supplementation of exogenous amylase in diets for dairy cows is designed to increase the utilization of starch in feeds.…”