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Effect of Palm Oil by-pass fat on Milk Composition of Early Lactation Holstein Cows Fed Whole Plant Corn Silage during Dry Season

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Journal of Agricultural Science and Technology(A) 2011年第8期1卷 1144-1149页

作者： Y. Han R Paengkoum D. F. Wang Guizhou Institute of Animal husbandry and Veterinary Science Guiyang 550005 Guizhou Province P R. China School of Animal Production Technology Suranaree University of Technology Muang Ditrict Nakhon Ratchasima 30000 Thailand

The objective of this study was to investigate the effect of Palm Oil by-pass fat （POBF） on milk composition of early lactation Holstein during dry season, 24 postpartum Holstein （1 d-14 d） were selected and align to two groups according to CRD experimental design; each group included 12 Holstein cows. The control received by-pass fat 0 g/h.d, the experimental group received by-pass fat 300 g/h.d. The results shown, DMI and yield of milk did not be affected with supplementation of by-pass fat, however, milk protein increased by 6.71%, milk fat increased by 8.16%, lactose increased by 0.22%, SNF increased by 1.98%, TS increased 4.08%; digestibility of diet protein decreased by 6.62%, digestibility of EE decreased by 7.96%, digestibility of NDF and ADL decreased by 1.36%, 8.97% respectively, digestibility of DM and OM decreased by 4.42, 3.07 percentage units; amount of C4-C17 milk fatty acids showed a decreased tendency, that of CIs-C22 showed an increased tendency, the milk CLA increased significantly （P 〈 0.01）. To sum up, supplementation of by-pass fat for early lactation Holstein is an important measure to balance energy and sustain milk yield and quality.

关键词： by-pass fat milk yield milk fat milk protein milk composition.

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Performance of Dairy Cows Supplemented with by-pass fat under Heat Stress Conditions

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Open Journal of Animal Sciences 2023年第1期13卷 82-97页

作者： Pablo Matías Roskopf María Paz Tieri Alejandra Cuatrin María Esperanza Ceron Cucchi José Ignacio Gere Eloy Eduardo Salado Rafaela Agricultural Experiment Station National Institute of Agricultural Technology (INTA) Rafaela Argentina Paraná Agricultural Experiment Station National Institute of Agricultural Technology (INTA) Paraná Argentina Institute of Pathobiology National Institute of Agricultural Technology (INTA) Castelar Argentina Engineering Research and Development Division National Technological University (UTN) National Scientific and Technical Research Council (CONICET) Buenos Aires Argentina

The objective of this study was to determine the effect of supplementation with a protected fat source on the productive response, metabolic environment and physiological indicators in Holstein cows under heat stress conditions during a 12-week experimental period. Thirty Holstein cows were distributed in 15 blocks by parity (2.0 ± 1.1), days in milk (182 ± 80) and milk production (29.4 ± 5.7 kg·day-1) at the beginning of the trial and randomly assigned within each block to the following treatments (diets): SPF: supplementation with protected fat or WPF: without supplementation with protected fat. All the cows were kept in a dry-lot where they were given a partial mixed ration (PMR) ad libitum while in the milking parlor they received individual supplementation depending on the treatment. The SPF diet contained 4.0 kg·day-1 concentrate in pellet form + 0.6 kg·day-1 ground corn grain + 0.7 kg·day-1 protected fat, while the WPF diet was similar to that offered in SPF, but the protected fat was isoenergetically replaced by ground corn grain. The fat supplement contained fats of animal and vegetable origin and microencapsulation was used for its preparation. Total dry matter and metabolic energy intakes were similar (p > 0.05) between treatments. fat corrected milk (4% FCM) production was higher (p = 0.04), while energy corrected milk and fat productions tended (p = 0.06) to be higher in cows from the SPF group, without effects (p > 0.05) on the rest of the milk production and composition parameters. These results could be attributed to an improvement in the efficiency of the use of the energy consumed. Protected fat supplementation neither modified the metabolic profile, nor reduced the respiratory rate and body temperature of heat-stressed cows. Future research is needed to explain this latter result.

关键词： Dairy Cattle by-pass fat Heat Stress

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