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One hundred ninety-two Continental × British steers (initial BW 926 lb [SD 54.5]) were used in a randomized complete block design finishing study to evaluate the effects of feeding two types of silage germplasm at two inclusion rates. A 2 × 2 factorial arrangement of treatments was used with either a conventional (CON) or increased expression of alpha-amylase (Enogen, Syngenta Seeds, LLC; ENO) hybrid fed at either 12% (12SIL) or 24% (24SIL) of diet DM. Steers were blocked (n = 5) and assigned randomly within block to treatments, resulting in five pens and 48 steers per treatment. Steers were harvested after 126 (12SIL) or 140 (24SIL) days on feed. There were no silage source by inclusion rate interactions detected for live growth performance. Silage source did not affect live based average daily gain (ADG), feed to gain ratio (F:G), or final BW (FBW; P ≥ 0.35). Feeding 24% silage reduced ADG (P = 0.04) and increased F:G (P = 0.01) but increased FBW (P = 0.02) compared to 12SIL. A source by inclusion rate interaction was detected (P = 0.04) for calculated yield grade (YG) with steers fed 24% silage having increased YG within CON but not ENO. Hot carcass weight and backfat were unaffected by silage source (P ≥ 0.81), but were increased by feeding 24% silage (P = 0.03 and P = 0.02, respectively). Feeding increased amounts of silage increased beef produced per acre (P = 0.05). Conventional silage produced more beef per acre (P < 0.01) due to differences in silage yield, but source of silage did not affect feedlot performance independent of silage yield. Feeding increased amounts of silage reduced DM efficiency on a live animal and carcass basis but increased beef produced per acre, which is of major value to cattle feeders who produce the majority of their own feedstuffs. Introduction Corn silage is a cornerstone feed ingredient for beef production in the Midwest. It is a versatile source of readily digestible energy and NDF and can be an effective option for marketing homeraised feedstuffs through cattle. Conventional wisdom has long held that the most effective use of corn silage has been in growing cattle, and that in finishing diets corn silage inclusion should be limited to no more than what is necessary to provide sufficient fiber to maintain rumen health. However, farmer feeders may desire to increase the utilization of silage for several factors including weather conditions, workload demands, or market signals. Few studies have evaluated silage usage in terms of amount of beef produced per unit of cropland. Hybrid selection also affects the amount of beef produced per acre of cropland as a result of yield but also due to potential variety differences in feed efficiency. Recently, corn hybrids with an increased expression of alpha-amylase enzyme have been marketed as a method to enhance starch digestion either when fed as grain or as corn silage. Silage from these hybrids has shown some promise in finishing diets utilizing steam-flaked corn (Baker et al., 2019), but there is little information regarding effects on performance and feed efficiency in diets typical for the Upper Midwest.

journal of animal science

4 Effect of Inclusion Rate of Silage With or Without the Presence of Alpha-Amylase on Feedlot Performance, Carcass Characteristics, and Efficiency Measures