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Evaluating rumen degradation of protected gelatin capsules filled with fish oil when fed to Holstein or Jersey lactating cows.

O. M. Peña

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06-23-2020

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Abstract:

T122
Evaluating rumen degradation of protected gelatin capsules filled with fish oil when fed to Holstein or Jersey lactating cows.
O. M. Peña*, S. Saunier, K. Murphy, N. M. Long, G. L. Lascano, M. J. Aguerre, T. C. Jenkins. Department of Animal and Veterinary Sciences, Clemson University Clemson, SC.

The main objective of this study was to evaluate the effect of breed on consumption and ruminal degradation of fish oil capsules. Other objective was to evaluate the effect of capsule treatment on milk fatty acid composition and content. Three Holstein (H; mean ± SD; 154.6 ± 17.6 kg/d; DIM), and 3 Jersey (J; mean ± SD; 119.6 ± 22.5 kg/d; DIM) ruminally-fistulated cows were randomly assigned to 1 of 3 treatments: (1) no capsules (CON), (2) untreated capsules (UC), and (3) treated capsules (TC) in a 3 × 3 Latin square design with 21-d periods. Cows were fed ad libitum a TMR composed of 10% alfalfa hay, 40% corn silage, 50% premix (DM basis) that contained 15.9% CP, 33% NDF and 27.6% starch. Samples and data collection were taken during the last 5 d of each period. Changes in weight and hardness (resistance to deformation) of TC were measured after 3 h of being in water at 39°C. Data were analyzed using JMP Pro 12 with the following preplanned orthogonal contrasts: (1) CON vs. (UC+TC), (2) UC vs. TG. There was no treatment effect on DMI (20.2 ± 1.18 kg/d). However, H consumed more than J (23.2 vs.17.3 kg/d; P < 0.02). Cows receiving UC and TC had higher (P < 0.01) milk yield compared with CON (30.7 vs 27.0 kg/d). Milk yield was higher (P < 0.04) for H vs J (34.6 vs. 24.4 kg/d). Milk fat % was not affected by treatments (mean ± SD 4.42 ± 0.39kg/d) but was numerically higher (P < 0.17) in J compared with H (4.90 vs 3.94%). Compared with control, feeding UC and TC increased the ruminal concentration of 20:5n-3 (0.033 vs. 0.064%; P < 0.01) and 22:6n-3 (0.029 vs. 0.074%; P < 0.07). In addition, J showed higher concentration of 20:5n-3 than H (0.061 vs. 0.047%; P < 0.03). It was observed that very few intact capsules were recovered from the rumen for both breeds. However, we were able to find several pieces of TC. Lab studies indicated that weight increased 60% and hardness was reduced by 98% post water incubation. Results from this study indicate that there was no effect of breed in capsule consumption. Data suggest that capsules were susceptible to breakage from abrasion when wet, both in the TMR and in the rumen.

Keywords: Holstein, Jersey, milk fat.