Dairy and Beef

Uterine, Ovarian, and Production Responses of Lactating Dairy Cows to Increasing Dietary Concentrations of Menhaden Fish Meal

Source: R. Mattos, C. R. Staples, J. Williams, A. Amorocho, M. A. McGuire, and W. W. Thatcher The primary objective was to determine whether the dietary polyunsaturated fatty acids, eicosapentaenoic (EPA, C20:5, n-3) and docosahexaenoic (DHA, C22:6, n-3), present in fish meal (FM) can attenuate uterine secretion of PGF2a in response to a challenge with […]

The Effects of Feeding Fish Oil on Uterine Secretion of PGF2a, Milk Composition, and Metabolic Status of Periparturient Holstein Cows

Source: R. Mattos, C. R. Staples, A. Arteche, M. C. Wiltbank, F. J. Diaz, T. C. Jenkins, and W. W. Thatcher The objectives were to determine the effect of dietary fish oil (FO) on uterine secretion of PGF2α, milk production, milk composition, and metabolic status during the periparturient period. Holstein cows were assigned randomly to […]

Milk Production and Composition, Ovarian Function, and Prostaglandin Secretion of Dairy Cows Fed Omega-3 Fats

Source: H. V. Petit, R. J. Dewhurst, N. D. Scollan, J. G. Proulx, M. Khalid, W. Haresign, H. Twagiramungu, and G. E. Mann Four multiparous Holstein cows were used in a 4 × 4 Latin square experiment to study the effects of fat sources rich in omega-3 fatty acids on milk production and composition, follicular […]

Influence of Undegraded Intake Protein Supplementation on Milk Production, Weight Gain, and Reproductive Performance in Postpartum Brahman Cows

Source: B. L. Triplett, D. A. Neuendorff, and R. D. Randel Eighty first-calf Brahman heifers and 51 mature Brahman cows were allotted to one of three diets based on parity, sex of calf, and breed of calf sire (Angus, Brahman, or Tuli) to evaluate rumen undegraded intake protein’s (UIP) influence on production characteristics and reproductive […]

Fish Meal Supplementation Alters Uterine Prostaglandin F2a Synthesis in Beef Heifers having Low Luteal Phase Progesterone

An experiment was conducted at Colorado State University to determine the effects of SeaLac® fish meal supplementation on uterine prostaglandin (PG) F2α synthesis in beef heifers having low luteal phase progesterone. Twenty-five Angus heifers were housed in individual pens and fed a corn silage-based diet (Table 1). Diets were supplemented with 5% fish meal (n […]

Effect of Supplemental Fish Meal on the Lactation and Reproductive Performance of Dairy Cows

Source: D. J. Carroll, F. R. Hossain, and M. R. Keller The influence of high protein diets (21% CP, DM basis), containing varied percentages of RUP, on lactation performance and fertility was evaluated. Sixty-two Holstein cows (65% multiparous) were blocked by age and randomly assigned to a 2 x 2 x 2 factorial design from […]

Effect of Increasing Levels of Undegradable Intake Protein on Metabolic and Endocrine Factors in Estrous Cycling Beef Heifers

Source: K. K. Kane, D. E. Hawkins, G. D. Pulsipher, D. J. Denniston, C. R. Krehbiel, M. G. Thomas, M. K. Petersen, D. M. Hallford, M. D. Remmenga, A. J. Roberts, and D. H. Keisler To determine the influence of three levels of undegradable intake protein (UIP) supplementation on metabolic and endocrine factors that influence […]

Effect of Fish Meal Supplementation on Plasma and Endometrial Fatty Acid Composition in Nonlactating Beef Cows

An experiment was conducted at Colorado State University to determine the effects of SeaLac® fish meal supplementation on blood and uterine ω-3 fatty acid composition. Seven nonlactating mature Angus cows were housed in individual pens and fed a corn silage-based diet for approximately 64 days (Table 1). Diets were supplemented with 5.1% fish meal (n […]

Utilization of Grass Silage by Growing Cattle: Effect of a Supplement Containing Ruminally Protected Amino Acids

Source: D. M. Veira, J. R. Seoane and J. G. Proulx Sixteen crossbred steers (278 +/- 4.9 kg) were used to determine the influence of supplemental ruminally protected lysine and methionine on performance of growing cattle fed grass silage. During the 154-d experiment, all steers were allowed ad libitum consumption of a good-quality grass silage […]

Using Rumen Undegraded Protein in Beef Diets to Improve Growth Performance in the Feedlot

A major determinant of production cost in the feedlot is the feed conversion ratio (FCR). The primary factors influencing FCR are digestible energy (DE) content of the diet and absorbable amino acid to metabolizable energy (AAME) ratio. Great improvement in DE would occur by removing roughage from the diet. Improving AAME in the diet requires […]

Protein Metabolism in the Rumen of Silage-Fed Steers: Effect of Fishmeal Supplementation

Source: JM Dawson, CI Bruce, PJ Buttery, M Gill, and DE Beever Ryegrass (Lolium perenne cv. Cropper) silage was given to four Friesian steers (initial live weight (LW) 172 kg) alone or with a fishmeal supplement (150 g fresh weight/kg silage dry matter (DM)) in a balanced two-period change-over design. The dietary components were the […]

Influence of Fish Oil in Finishing Diets on Growth Performance, Carcass Characteristics, and Sensory Evaluation of Cattle

Source: T. J. Wistuba, E. B. Kegley, and J. K. Apple Inclusion of fish oil, a source of n-3 fatty acids, in ruminant diets may fortify the fatty acid composition of meats and alter consumer perceptions of taste. Therefore, a 70-d study of 16 crossbred steers (441 ± 31.7 kg of initial BW; 4 steers/pen; […]

Influence of Fish Meal and Supplemental Fat on Performance of Finishing Steers Exposed to Moderate or High Ambient Temperatures

Source: T. W. White, L. D. Bunting, L. S. Sticker, F. G. Hembry, and A. M. Saxton Ninety-six Hereford x Angus steers E initial BW = 295 kgl were used in two growth experiments conducted at moderate and high ambient temperatures (AT), 48 steers per AT. Within each AT, calves were assigned to six dietary […]

Effect of Supplemental Fish Meal Protein on Site and Extent of Digestion in Beef Steers

Source: M. N. Streeter and M. J. Mathis The effects of supplemental fish meal on site and extent of digestion were determined using four steers equipped with ruminal, duodenal, and ileal cannulas. Fish meal was included in diets to supply 0 (0FM), 25 (25FM), 50 (50FM), or 75 (75FM) g of N daily above the […]

Balancing Diets to Meet the Animal’s Requirement for Absorbable Amino Acids

Source: J. W. Golden, M. S. Kerley, and N. A. Pyatt A study was conducted to determine if growth rate and gain to feed ratio (GF) could be improved in feedlot steers by balancing the diet for absorbable amino acid requirements. The ruminally degradable protein (RDP) in the diet met, but did not exceed predicted […]

Uterine, Ovarian, and Production Responses of Lactating Dairy Cows to Increasing Dietary Concentrations of Menhaden Fish Meal

Source: R. Mattos, C. R. Staples, J. Williams, A. Amorocho, M. A. McGuire, and W. W. Thatcher The primary objective was to determine whether the dietary polyunsaturated fatty acids, eicosapentaenoic (EPA, C20:5, n-3) and docosahexaenoic (DHA, C22:6, n-3), present in fish meal (FM) can attenuate uterine secretion of PGF2a in response to a challenge with […]

The Effects of Feeding Fish Oil on Uterine Secretion of PGF2a, Milk Composition, and Metabolic Status of Periparturient Holstein Cows

Source: R. Mattos, C. R. Staples, A. Arteche, M. C. Wiltbank, F. J. Diaz, T. C. Jenkins, and W. W. Thatcher The objectives were to determine the effect of dietary fish oil (FO) on uterine secretion of PGF2α, milk production, milk composition, and metabolic status during the periparturient period. Holstein cows were assigned randomly to […]

Milk Production and Composition, Ovarian Function, and Prostaglandin Secretion of Dairy Cows Fed Omega-3 Fats

Source: H. V. Petit, R. J. Dewhurst, N. D. Scollan, J. G. Proulx, M. Khalid, W. Haresign, H. Twagiramungu, and G. E. Mann Four multiparous Holstein cows were used in a 4 × 4 Latin square experiment to study the effects of fat sources rich in omega-3 fatty acids on milk production and composition, follicular […]

Influence of Undegraded Intake Protein Supplementation on Milk Production, Weight Gain, and Reproductive Performance in Postpartum Brahman Cows

Source: B. L. Triplett, D. A. Neuendorff, and R. D. Randel Eighty first-calf Brahman heifers and 51 mature Brahman cows were allotted to one of three diets based on parity, sex of calf, and breed of calf sire (Angus, Brahman, or Tuli) to evaluate rumen undegraded intake protein’s (UIP) influence on production characteristics and reproductive […]

Fish Meal Supplementation Alters Uterine Prostaglandin F2a Synthesis in Beef Heifers having Low Luteal Phase Progesterone

An experiment was conducted at Colorado State University to determine the effects of SeaLac® fish meal supplementation on uterine prostaglandin (PG) F2α synthesis in beef heifers having low luteal phase progesterone. Twenty-five Angus heifers were housed in individual pens and fed a corn silage-based diet (Table 1). Diets were supplemented with 5% fish meal (n […]

Effect of Supplemental Fish Meal on the Lactation and Reproductive Performance of Dairy Cows

Source: D. J. Carroll, F. R. Hossain, and M. R. Keller The influence of high protein diets (21% CP, DM basis), containing varied percentages of RUP, on lactation performance and fertility was evaluated. Sixty-two Holstein cows (65% multiparous) were blocked by age and randomly assigned to a 2 x 2 x 2 factorial design from […]

Effect of Increasing Levels of Undegradable Intake Protein on Metabolic and Endocrine Factors in Estrous Cycling Beef Heifers

Source: K. K. Kane, D. E. Hawkins, G. D. Pulsipher, D. J. Denniston, C. R. Krehbiel, M. G. Thomas, M. K. Petersen, D. M. Hallford, M. D. Remmenga, A. J. Roberts, and D. H. Keisler To determine the influence of three levels of undegradable intake protein (UIP) supplementation on metabolic and endocrine factors that influence […]

Effect of Fish Meal Supplementation on Plasma and Endometrial Fatty Acid Composition in Nonlactating Beef Cows

An experiment was conducted at Colorado State University to determine the effects of SeaLac® fish meal supplementation on blood and uterine ω-3 fatty acid composition. Seven nonlactating mature Angus cows were housed in individual pens and fed a corn silage-based diet for approximately 64 days (Table 1). Diets were supplemented with 5.1% fish meal (n […]

Utilization of Grass Silage by Growing Cattle: Effect of a Supplement Containing Ruminally Protected Amino Acids

Source: D. M. Veira, J. R. Seoane and J. G. Proulx Sixteen crossbred steers (278 +/- 4.9 kg) were used to determine the influence of supplemental ruminally protected lysine and methionine on performance of growing cattle fed grass silage. During the 154-d experiment, all steers were allowed ad libitum consumption of a good-quality grass silage […]

Using Rumen Undegraded Protein in Beef Diets to Improve Growth Performance in the Feedlot

A major determinant of production cost in the feedlot is the feed conversion ratio (FCR). The primary factors influencing FCR are digestible energy (DE) content of the diet and absorbable amino acid to metabolizable energy (AAME) ratio. Great improvement in DE would occur by removing roughage from the diet. Improving AAME in the diet requires […]

Protein Metabolism in the Rumen of Silage-Fed Steers: Effect of Fishmeal Supplementation

Source: JM Dawson, CI Bruce, PJ Buttery, M Gill, and DE Beever Ryegrass (Lolium perenne cv. Cropper) silage was given to four Friesian steers (initial live weight (LW) 172 kg) alone or with a fishmeal supplement (150 g fresh weight/kg silage dry matter (DM)) in a balanced two-period change-over design. The dietary components were the […]

Influence of Fish Oil in Finishing Diets on Growth Performance, Carcass Characteristics, and Sensory Evaluation of Cattle

Source: T. J. Wistuba, E. B. Kegley, and J. K. Apple Inclusion of fish oil, a source of n-3 fatty acids, in ruminant diets may fortify the fatty acid composition of meats and alter consumer perceptions of taste. Therefore, a 70-d study of 16 crossbred steers (441 ± 31.7 kg of initial BW; 4 steers/pen; […]

Influence of Fish Meal and Supplemental Fat on Performance of Finishing Steers Exposed to Moderate or High Ambient Temperatures

Source: T. W. White, L. D. Bunting, L. S. Sticker, F. G. Hembry, and A. M. Saxton Ninetysix Hereford x Angus steers E initial BW = 295 kgl were used in two growth experiments conducted at moderate and high ambient temperatures (AT), 48 steers per AT. Within each AT, calves were assigned to six dietary […]

Effects of Fish Meal in Beef Cattle Diets on Growth Performance, Carcass Characteristics, and Fatty Acid Composition of Longissimus Muscle

Source: I. B. Mandell, J. G. Buchanan-Smith, B. J. Holub, and C. P. Campbell We investigated the effects of fish meal (FM) in beef cattle diets on growth performance, carcass characteristics, and fatty acid (FA) composition of longissimus muscle in 63 yearling steers (335 ± 23 kg). High-moisture corn and alfalfa silage diets were supplemented […]

Effect of Supplemental Fish Meal Protein on Site and Extent of Digestion in Beef Steers

Source: M. N. Streeter and M. J. Mathis The effects of supplemental fish meal on site and extent of digestion were determined using four steers equipped with ruminal, duodenal, and ileal cannulas. Fish meal was included in diets to supply 0 (0FM), 25 (25FM), 50 (50FM), or 75 (75FM) g of N daily above the […]

Balancing Diets to Meet the Animal’s Requirement for Absorbable Amino Acids

Source: J. W. Golden, M. S. Kerley, and N. A. Pyatt A study was conducted to determine if growth rate and gain to feed ratio (GF) could be improved in feedlot steers by balancing the diet for absorbable amino acid requirements. The ruminally degradable protein (RDP) in the diet met, but did not exceed predicted […]