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Production performance of lactating dairy cows fed two rumen protected methionine supplements
Francia, F.; Rodriguez-Prado, M.E...
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Intorduction: The new formulation systems have refined requirements and supplies of digestible protein and amino acids through the description of different feed protein fractions and digestive processes, and the incorporation of dynamic adaptation (NRC, 2001; INRA, 2018, CNCPS, Van Ambourgh et al., 2015). Despite all these improvements, the efficiency reported at 23.7% 50 years ago (Stone et al., 1960) remains virtually unchanged at 24.0% (Hristov and Huhtanen, 2008). This low efficiency represents a production cost and the emission of excessive N to the environment. Recent evidence indicates that at least part of this inefficiency is associated with the unbalanced supply of essential amino acids (Doepel and Lapierre, 2010). The supply of intestinally available essential amino acids is currently achieved through the use of rumen-protected forms of these amino acids. However, there are large differences in bioavailability of different protected methionine sources (Whitehouse et al., 2017) which may affect performance. The objective of this research is to determine the effect of feeding two different sources of Met on milk production and composition of lactating Holstein dairy cows.
Material and Methods: Ninety-four multiparous lactating Holstein dairy cows from 50 to 110 days in milk were divided in 3 groups to determine the effect of feeding different rumen protected Methionine sources on milk production and composition. Cows were fed a 46:54 forage to concentrate based on corn silage once daily formulated to meet current NRC (2001) recommendations (17.5% CP, 28.4% NDF, 33.2% starch and 4.6% fat and balanced for Lysine). Treatments were the control diet (CTR), and the same diet supplemented with 11.4 g of metabolizable methionine from either KES (KESSENT® M, Kemin Animal Nutrition and Health) or SMT (Smartamine® M, Adisseo Inc.). Experimental animals were blocked by previous milk production, assigned to three different lots and supplied with one of the three treatments. Cows were milked three times daily. After 30 days on treatment, milk production and composition were determined in weeks 6 and 10 postpartum (milk samples taken 3 consecutive days). Data were analyzed using the PROC GLM procedure of SAS as a completely randomized model.
Results: Milk yield (kg/d) was higher (P<0.002) in KES (46.7) than CTR or SMT (43.9 and 44.5, respectively). The 3.5% fat corrected milk (kg/d) was numerically higher in KES and SMT (51.3 and 50.6, respectively) compared with CTR (48.8), but did not reach significance (P<0.11). Milk fat content (%) tended to be higher (P<0.06) in SMT (4.38) than in CTR or KES (4.16 and 4.14, respectively). Milk protein content (%) was higher (P<0.04) in KES and SMT (3.09 and 3.11, respec- tively) compared with CTR (3.04). Similar effects (P<0.02) were observed for casein (%) (2.40, 2.43 and 2.45 for CTR, KES and SMT, respectively). Milk fat yield (kg/d) was similar among treatments (1.90), but protein yield (kg/d) was higher
(P<0.01) in KES (1.43) compared with CTR and SMT (1.33 and 1.38, respectively). Casein yield (kg/d) was also higher (P<0.01) in KES (1.13) compared with CTR and SMT (1.05 and 1.09, respectively).
Conclusions: Both rumen protected Methionine supplements improved dairy cow performance compared with control, but also significant differences between commercial supplements were observed.
Keywords: Rumen protected methionine, dairy cow performance.
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Affiliation of the authors at the time of publication
Animal Nutrition and Welfare Service, Universitat Autonoma de Barcelona, Bellaterra, Spain;
Centre Veterinari Tona, Tona, Spain.
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