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Feeding Calcium Salts of Linseed Oil on Metabolic Status and Reproductive Traits in Grazing Dairy Cows

Open Journal of Animal Sciences 2024年第3期14卷 219-233页

作者： Jesica Daniela Iorio Yaliska Moreno González Maria Florencia Olmeda Dino Curletto Daniel Edgardo Scandolo Martin Guillermo Maciel Rafael Alejandro Palladino Mauricio Javier Giuliodori Eloy Eduardo Salado School of Agriculture of the University of Buenos Aires (FAUBA) Buenos Aires Argentina Faculty of agricultural Sciences National University of Lomas de Zamora (UNLZ) Lomas de Zamora Argentina rafaela agricultural experiment station National Institute of Agricultural Technology (INTA) Rafaela Argentina Faculty of Veterinary Science La Plata National University (FCV) La Plata Argentina

This experiment aimed to evaluate the effect of calcium salts of linseed oil (rich in alpha-linolenic acid (ALA, C18:3n-3) on metabolic and reproductive traits in high-producing dairy cows under grazing. Thirty-six Holstein dairy cows were randomly assigned, in a complete block design, to receive ALA supplementation (0.85 kg∙day−1 of calcium salts of linseed oil) or to remain as untreated control (CON). The concentrate was formulated to offer the same amount of energy across treatments (CON cows received an extra kg of corn to compensate for the higher energy density of ALA treatment). A PMR + Alfalfa pasture was offered to all cows at the same time. A fixed time artiﬁcial insemination (FTAI) at 80 DIM, preceded by a Presynch plus Ovsynch protocol was implemented for the first service and later, on return to estrus, heat detection and artiﬁcial insemination (AI) were performed. Pregnancy diagnosis was checked at 30, 42, 60, and 90 d after AI. Blood and milk samples were taken biweekly. Treatment affected plasma cholesterol concentration (160.36 vs. 186.70 mg∙dl−1, p = 0.03, for ALA and CON, respectively) and on size of corpus luteum (CL, 17.6 vs. 13.7 mm, p = 0.02, for ALA and CON, respectively). Supplementation tended (p = 0.136) to increase conception rate by 200 DIM (81.69% vs. 55.43% in ALA and CON cows, respectively). However, treatment had no effect (p > 0.05) on body weight (BW), body condition score (BCS), and circulating levels of beta-hydroxybutyrate (BHBA), glucose, insulin, growth hormone (GH) and insulin-like growth factor (IGF-I). Our results suggest that supplementation with calcium salts of linseed oil could enhance ovarian function without affecting energy metabolism in early lactation dairy cows.

关键词： α-Linolenic Acid Supplementation Reproduction Grazing Dairy Cows

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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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Feeding Calcium Salts of Linseed Oil on Productive Performance and Milk Fatty Acid Profile in Grazing Dairy Cows

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Open Journal of Animal Sciences 2020年第4期10卷 761-781页

作者： Yaliska Moreno González Jesica Iorio María Florencia Olmeda Dino Curletto Daniel Scandolo Martín Guillermo Maciel Alejandra Cuatrin Rafael Alejandro Palladino Carolina Pérez Eloy Eduardo Salado Faculty of Agriculture University of Buenos Aires Buenos Aires Argentina Faculty of agricultural Science National University of Lomas de Zamora Buenos Aires Argentina INTA (National Institute of experimental Agriculture) Research Station Rafaela Rafaela Santa Fe Argentina CONICET (National Research Council of Argentina) Buenos Aires Argentina INTA (National Institute of experimental Agriculture) Food Technology Institute Castelar Buenos Aires Argentina

The objective of this study was to determine the effect of supplying calcium salts of linseed oil (Ca-FA) rich in omega-3 (α-linolenic acid) on the production and chemical composition of milk and its nutraceutical value in dairy cows in early lactation. The trial lasted 12 weeks (2 weeks for adaptation to lipids and 10 weeks of data collection). A total of 36 Holstein dairy cows with 58.0 ± 17.0 days in milk (DIM), 594.1 ± 92.4 kg BW, 2.6 ± 1.5 parity and 38.9 ± 9.3 kg milk day-1 were used in a randomized complete block design. The treatments were: 1) Omega-3 (O3): 5.2 kg DM day-1 of concentrate including 0.7 kg DM of Ca-FA + 13.5 kg DM day-1 of partial mixed ration (PMR) + 12 kg DM day-1 of alfalfa pasture (Medicago sativa) and 2) Control (C): diet similar to O3 but lipid supplementation was replaced by cracked corn grain so that the diets were isoenergetic. No treatment effect was detected (P > 0.05) for any milk production and composition variables, except for urea in milk that was slightly higher in O3 (P = 0.02). The treatment × week interaction was significant (P ·day-1 and 3.86% vs. 3.23% for fat yield and content, respectively). Total DMI and PMR were similar (P > 0.05) between treatments. Concentrate intake was higher (P < 0.01) in C compared with O3. Pasture DMI tended (P = 0.06) to be greater for cows that

关键词： Dairy Cow Calcium Salts of Linseed Oil α-Linolenic Acid Nutraceutical Value

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