category: feed additives
authors: m. blanch, f. bargo, g. tedó, i. r. ipharraguerre, i. guasch, a. bach.
book/journal:2017 adsa annual meeting (pittsburgh), journal of dairy science, volume 100, supplement 2 (abstract: m233).
the aim of this study was to evaluate changes in feeding behavior and performance of lactating dairy cows in response to the addition of sensory additives into their tmr. a 90-d experiment was conducted involving 42 lactating cows (15 primiparous, 27 multiparous; bw = 690 ± 63 kg; dim = 148 ± 73; milk yield = 38 ± 8 kg/d) randomly allocated to 3 treatments and fed a common tmr (15.4% cp, 29.2% ndf, 1.67 mcal of nel/kg). treatments were either no supplementation (con) or supplementation with sensory additive a (saa - containing stevia glycosides) or b (sab - the same formulation without stevia glycosides) at 30 g/d. dry matter intake (dmi), milk production, milk composition, bw, feeding behavior, and feed efficiency (fe) were determined daily. data were analyzed with a mixed-effect model that included the fixed effects of treatment, parity, week, and their 2-way interactions. results are shown in table 1. feed intake was reduced (p < 0.001) when both sensory additives were added into the tmr.however, milk yield and composition did not differ among treatments.regarding feeding behavior, sab reduced (p < 0.001) the number of meals and eating time, and increased (p < 0.001) meal size compared with saa and con. in contrast, saa reduced meal size (p < 0.001) and eating rate (p < 0.001) compared with sab and con. the use of sweet sensory additives may modulate feeding behavior in lactating dairy cows; nevertheless, such a response appears to be dictated by their composition (i.e., sweet ingredients).