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Kansas Agricultural Experiment Station Research Reports

1988

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Articles 31 - 60 of 90

Full-Text Articles in Life Sciences

An Alternative To Sulfa-Containing Antibiotics For Starter Pigs (1988), R C. Thaler, Jim L. Nelssen Jan 1988

An Alternative To Sulfa-Containing Antibiotics For Starter Pigs (1988), R C. Thaler, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

An on-farm starter trial was conducted to compare the efficacy of a non-sulfa containing antibiotic (Mecadox®) to that of a sulfa-containing antibiotic (ASP-250®). Two hundred and forty pigs weaned at 3 wk of age were placed in a hot-nursery and all fed a high nutrient density diet containing the antibiotic apramycin (Apralan®) for 1 week. For the next 3 wk, pigs received complex diets containing either ASP-250 or Mecadox. Pigs were then moved. to a cold nursery and fed simple diets with the same antibiotic treatment for the final 2 wk. Average daily gain, average daily feed intake, and feed …

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Low Investment Farrowing Facilities (1988), James P. Murphy Jan 1988

Low Investment Farrowing Facilities (1988), James P. Murphy

Kansas Agricultural Experiment Station Research Reports

Low investment farrowing facilities can be divided into three categories, depending on the level of investment. At the lowest investment level, an individual farrowing shelter that has no floor is utilized. The shelter can be as simple as two sheets of plywood nailed together to create an A frame. Sometimes, rounded "quonset" shelters also are utilized. Since the weather protection is somewhat limited, these types of shelters are normally used to farrow only in the spring and fall. This is sometimes called the two-litter system. Farrowing is normally done on pastures. The shelters utilize no supplemental heat and have no …

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Evaluation Of Interseeded Grain Sorghum And Soybeans As 8 Silage Crop, S.H.M. Esmail, K. Bolsen, S. Azimi, John E. Shirley Jan 1988

Evaluation Of Interseeded Grain Sorghum And Soybeans As 8 Silage Crop, S.H.M. Esmail, K. Bolsen, S. Azimi, John E. Shirley

Kansas Agricultural Experiment Station Research Reports

Interseeded grain sorghum and soybeans were harvested at late-boot, milk, and late-dough maturity stages of the sorghum (62, 77, and 91 days post-planting, respectively). Maximum dry matter yield occurred at the late-dough stage and interseeded silages had higher crude protein contents than the control, late-dough) grain sorghum silage. All silages underwent normal homolactic fermentations and were well preserved. Cellulose and acid detergent fiber contents were also higher in the mixtures than in the control silage, but fiber values decreased as maturity advanced. Digestibilities of most nutrients were similar in the rations, but when considered with chemical composition and yield data, …

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Effect Of Environmental Temperature And Inoculants On The Fermentation Of Alfalfa And Forage Sorghum Silages, K. Bolsen, A. Laytimi, L. Nuzback, R. Hart Jan 1988

Effect Of Environmental Temperature And Inoculants On The Fermentation Of Alfalfa And Forage Sorghum Silages, K. Bolsen, A. Laytimi, L. Nuzback, R. Hart

Kansas Agricultural Experiment Station Research Reports

The inoculants, TriLac ®and Ecosyl® increased the rate and efficiency of the ensiling process in both high (50%) and low (32.5%) dry matter alfalfa, regardless of temperature. In both alfalfa trials, the inoculated silages had significantly lower pH, acetic acid, ethanol, and ammonia-nitrogen values and higher lactic acid values than their control counterparts. The inoculants worked equally well when fermentation was at 60 or 90 F. Although similar effects were obtained with forage sorghum, the differences were not as pronounced as those for the alfalfa silages.

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Selecting Forage Sorghum Cultivars For Silage, J. White, K. Bolsen, B. Kirch, L. Pfaff Jan 1988

Selecting Forage Sorghum Cultivars For Silage, J. White, K. Bolsen, B. Kirch, L. Pfaff

Kansas Agricultural Experiment Station Research Reports

Eighty forage sorghum cultivars were compared in 1986 for agronomic and silage quality traits. Silage yield ranged from 5.3 to 10.0 tons (t) of dry matter (DM) per acre (mean, 7.4 t); grain yield, from 13 to 113 bushels (bu) per acre (mean, 66 bu). Percent lodging was extremely high, with a mean of 51% and only one cultivar free of lodging. Pre-ensiled DM content ranged from 22.2 to 35.4% (mean, 27.4%) and plant height from 85 to 180 inches (mean, 121 inches). Silage quality results showed that in vitro DM digestibility ranged from 44.6 to 62.1% (mean, 53%); crude …

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Effect Of Cobactin On The Feedlot Performance And Carcass Traits Of Beef Steers, L. Corah, Ronald V. Pope Jan 1988

Effect Of Cobactin On The Feedlot Performance And Carcass Traits Of Beef Steers, L. Corah, Ronald V. Pope

Kansas Agricultural Experiment Station Research Reports

The addition of Cobactin to feedlot rations had no significant effect on average daily gain or feed efficiency, but did improve quality grade of steers fed for 110 days.

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Relationship Between Agronomic And Silage Quality Traits Of Forage Sorghum Cultivars, J. White, K. Bolsen, B. Kirch Jan 1988

Relationship Between Agronomic And Silage Quality Traits Of Forage Sorghum Cultivars, J. White, K. Bolsen, B. Kirch

Kansas Agricultural Experiment Station Research Reports

Results from two trials evaluating 11 forage sorghums as silage crops indicated that silage quality traits of voluntary intake, digestibility, and crude protein content were linearly associated with the agronomic characteristics of days to half bloom and plant height. Intake was negatively associated with plant height (r = -.49); digestibility was negatively associated with days to half bloom (r = -.39) and plant height (r = -.49); and crude protein was negatively associated with days to half bloom (r = - .51) and plant height (r = -. 71). Within the same cultivar, but between years, voluntary intake varied by …

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Effects Of Ultra Pig Krave Extra® On Starter Pig Performance (1988), G R. Stoner, M E. Johnston, Jim L. Nelssen, Robert H. Hines Jan 1988

Effects Of Ultra Pig Krave Extra® On Starter Pig Performance (1988), G R. Stoner, M E. Johnston, Jim L. Nelssen, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

A growth study and a preference study were conducted to evaluate the effect of a commercially available flavoring agent on starter pig performance. A total of 192, 3-wk old, weaned pigs were utilized. A 2-phase starter program was used in the growth study. Half the pigs received creep feed with added flavor and half without, beginning at 10 days of age. Pigs receiving flavored feed at 10 days of age had significantly better gains and feed intake the first 2 wk postweaning than pigs on nonflavored feed. The pigs in the preference study demonstrated a clear preference for flavored vs …

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Responses Of Pig Embryos To Amino Acids (1988), C F. Rosenkrans, Duane L. Davis Jan 1988

Responses Of Pig Embryos To Amino Acids (1988), C F. Rosenkrans, Duane L. Davis

Kansas Agricultural Experiment Station Research Reports

Mixtures of vitamins and amino acids produced detrimental effects on the development of pig embryos. However, addition of three amino acids, phenylalanine, methionine, and isoleuncine, enhanced pig embryo development.; Swine Day, Manhattan, KS, November 17, 1988

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Effects Of Raw Soybeans, Roasted Soybeans, And Soybean Oil On Finishing Pig Performance (1988), Robert D. Goodband, Robert H. Hines Jan 1988

Effects Of Raw Soybeans, Roasted Soybeans, And Soybean Oil On Finishing Pig Performance (1988), Robert D. Goodband, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

Two trials were conducted to evaluate the effects of raw soybeans, roasted soybeans, and soybean oil on finishing pig performance. In trial 1 pigs were fed a low protein control diet containing 7.5% soybean meal and synthetic lysine. Raw soybeans were added at levels of 8.75, 11.90, 15.05, and 18.20% of the diet. The raw soybean additions replaced the synthetic lysine and part of the milo in the diet and provided lysine levels of .60, .67, .74, and .81% as raw soybean level increased, respectively. Increasing level of raw soybeans had no affect on average daily gain (ADG) or average …

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The Effects Of Porcine Somatotropin (Pst) And Dietary Lysine Level On Growth Performance And Carcass Characteristics Of Finishing Swine (1988), R C. Thaler, B R. Schricker, G E. Fitzner, A J. Lewis, Robert D. Goodband, Jim L. Nelssen, Robert H. Hines, Donald H. Kropf Jan 1988

The Effects Of Porcine Somatotropin (Pst) And Dietary Lysine Level On Growth Performance And Carcass Characteristics Of Finishing Swine (1988), R C. Thaler, B R. Schricker, G E. Fitzner, A J. Lewis, Robert D. Goodband, Jim L. Nelssen, Robert H. Hines, Donald H. Kropf

Kansas Agricultural Experiment Station Research Reports

Seventy-two finishing pigs averaging 130 lb were utilized to determine the effects of PST and dietary lysine on growth performance and carcass characteristics. Pigs were injected daily with 4 mg PST in the extensor muscle of the neck and fed either a pelleted corn-sesame meal diet (.6% lysine, 17.7% crude protein) or diets containing .8, 1.0, 1.2, or 1.4% lysine provided by L-lysine HCl. All diets were formulated to contain at least 200% of NRC (1979) recommendations for other amino acids. Control pigs received a placebo injection and the .6% lysine diet. Increasing levels of dietary lysine resulted in increased …

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Comparison Of Wet Versus Dry Feeding For Starter Pigs (1988), R C. Thaler, Jim L. Nelssen Jan 1988

Comparison Of Wet Versus Dry Feeding For Starter Pigs (1988), R C. Thaler, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

Two studies utilizing a total of 480 pigs (21 days old) were conducted to compare wet versus dry feeding during a 4 wk starter period. Pigs were fed a pelletized, high nutrient density diet for the first 2 wk and a semi-complex diet (meal form) for the last 2 wk. Aqua® feeders were used in all pens. During the first 2 wk of the study, feeding method had no effect on daily gain or feed intake; however, pigs fed dry diets required less feed per pound of gain than did pigs consuming wet diets (P<.0002). For the overall 4 wk trial, gains and feed intake did not differ between treatments, but pigs fed the wet diets were less efficient than pigs receiving the dry diets. Based on these results, wet feeding is not advantageous to starter pig performance.; Swine Day, Manhattan, KS, November 17, 1988

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Space Requirement Of Finishing Pigs Fed To Heavier Weight (1988), David A. Nichols, Robert H. Hines, Robert D. Goodband, Jim L. Nelssen Jan 1988

Space Requirement Of Finishing Pigs Fed To Heavier Weight (1988), David A. Nichols, Robert H. Hines, Robert D. Goodband, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

Two trials, using a total of 240, crossbred, finishing pigs were conducted to evaluate 7, 9, and 11 ft^2 space allowance per pig from approximately 115 lb to a market weight of 250 lb. Pigs were removed individually each week as they reached the desired weight. Pigs reared in pens with 7 ft^2 had a reduced average daily feed intake and a significantly reduced average daily gain compared to those with 9 and 11 ft^2. Feed/gain was the same for all treatments; however, the pigs with 7 ft^2 required 4 days longer to reach 250 lb. Performance data suggests that …

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Transient Hypersensitivity To Soybean Meal In The Early-Weaned Pig (1988), D F. Li, G Reddy, Frank Blecha, Joe D. Hancock, G Allee, Jim L. Nelssen Jan 1988

Transient Hypersensitivity To Soybean Meal In The Early-Weaned Pig (1988), D F. Li, G Reddy, Frank Blecha, Joe D. Hancock, G Allee, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to determine if baby pigs develop intestinal hypersensitivity to dietary soy protein. Challenging nursery pigs with soybean meal following oral infusion of soybean meal from day 7 to day 14 of age resulted in villus atrophy and lower average daily gain by 28 days of age. At 56 days of age, there were no differences in weight gains between pigs fed soy protein and pigs fed milk protein. Pigs exposed to soybean meal before weaning had increased anti-soybean protein immnoglobulin titers at 4 wk (7.2 vs 4.0) and at 8 wk (7.6 vs 4.2). Thus, challenging …

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Effect Of Dietary Folic Acid Additions On Sow Performance Through Two Parities (1988), R C. Thaler, G L. Allee, Jim L. Nelssen, Robert D. Goodband Jan 1988

Effect Of Dietary Folic Acid Additions On Sow Performance Through Two Parities (1988), R C. Thaler, G L. Allee, Jim L. Nelssen, Robert D. Goodband

Kansas Agricultural Experiment Station Research Reports

A total of 153 gilts from three breeding groups were fed gestation/lactation diets supplemented with either 0, 1.5, or 6.0 g of folic acid/ton of complete feed for two consecutive parities. Serum folate levels were linearly increased by dietary additions of folic acid throughout gestation and lactation, but serum glucose and urea levels were unaffected by treatment. Stage of life cycle also had an effect on serum folate level. Generally, folate levels decreased from breeding to day 60 of gestation in parity 1 for all treatments, then increased through lactation. In parity 2, folate levels decreased up to day 90 …

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Evaluation Of Mga And Prostaglandin As An Estrous Synchronization Procedure Under Field Conditions, P.L. Houghton, L.R. Corah, T.B. Goehring Jan 1988

Evaluation Of Mga And Prostaglandin As An Estrous Synchronization Procedure Under Field Conditions, P.L. Houghton, L.R. Corah, T.B. Goehring

Kansas Agricultural Experiment Station Research Reports

When fed MGA (0.5 mg.hd/day) for 14 days, followed by a prostaglandin injection 17 days later, a total of 736 out of 1112 heifers at 11 locations expressed signs of estrus within 5 days following the PG injection for a 66.2% response to synchronization. Response rates between locations ranged from 33 to 95% (P<.05). In a comparison of prostaglandin forms at 5 locations, using 789 heifers, response to synchronization was similar (P=.66) between Lutalyse® (62.7% response) and Bovilene® (59.6% response). First-service conception rate was compared in 411 heifers at two locations and was higher for Lutalyse (68.996) than Bovilene (59.996) (P<.08). First-service conception rate varied by technician (P<.05) and ranged from 48.7 to 83.6%.

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The Influence Of Stage Of Pregnancy On Digestion Characteristics In Beef Cows, A. Beharka, B. Cochran, D. Harmon, T. Avery Jan 1988

The Influence Of Stage Of Pregnancy On Digestion Characteristics In Beef Cows, A. Beharka, B. Cochran, D. Harmon, T. Avery

Kansas Agricultural Experiment Station Research Reports

Feed intake during the final trimester of gestation did not appear to vary significantly until 2 weeks before calving, after which it decreased dramatically. Measurements during two periods in the final trimester suggested that passage rate increased and digestibility decreased, as pregnancy proceeded.

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Comparison Of Feedlot Performance Of Steer Calves Produced By Angus X Hereford And Brahman X Hereford Cows, J.R. Brethour, D. Patterson, K. Olson, L. Corah Jan 1988

Comparison Of Feedlot Performance Of Steer Calves Produced By Angus X Hereford And Brahman X Hereford Cows, J.R. Brethour, D. Patterson, K. Olson, L. Corah

Kansas Agricultural Experiment Station Research Reports

Steer calves that were 75 percent Hereford and either 25 percent Angus (BWF) or Brahman (BRX) were compared in a feedlot study that involved either high-concentrate or high-silage finishing rations. The BRX steers gained significantly faster, but there was no concomitant response in feed efficiency. The ration energy utilization by BRX steers appeared to be less than that of BWF steers. Performance of both breeds was poorer on the high-silage ration than on the high-grain ration, and there was no breed by ration interaction. A greater proportion of BWF calves graded USDA choice, but there was little difference between breeds …

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Influence Of Limited-Creep Feeding On Pre And Postweaning Performance Of Spring Born Calves, P. Houghton, F. Brazle, Gerry L. Kuhl, B. Schalles, K. Zoellner Jan 1988

Influence Of Limited-Creep Feeding On Pre And Postweaning Performance Of Spring Born Calves, P. Houghton, F. Brazle, Gerry L. Kuhl, B. Schalles, K. Zoellner

Kansas Agricultural Experiment Station Research Reports

Two limited-creep feeding trials were conducted in Northwest and Southeast Kansas using spring-born, suckling calves to evaluate the effect of available forage supply on creep-fed calf performance. Energy vs. protein creep feeds were compared at each location. Creep feed intake was limited with salt to achieve an average daily intake of about 1.5 lb per head. Calves consuming the limited energy and protein creep feeds gained from 0.1 to 0.6 lb more per head daily preweaning, and required 2.3 to 7.6 lb of creep per lb of extra weaning weight. Postweaning gains of the noncreep-fed calves were .12 to .27 …

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Influence Of Supplemental Protein Concentration On The Performance Of Beef Cows Grazing Dormant Bluestem Range, T. Delcurto, B. Cochran, L. Corah Jan 1988

Influence Of Supplemental Protein Concentration On The Performance Of Beef Cows Grazing Dormant Bluestem Range, T. Delcurto, B. Cochran, L. Corah

Kansas Agricultural Experiment Station Research Reports

Three milo/soybean meal mixtures representing three supplemental crude protein concentrations (13, 26, and 39%) were evaluated in terms of pregnant beef cow performance. Cow weight and body condition changes responded in a linear fashion to increasing protein. Cattle fed the high protein (39% Crude Protein) supplement lost the least weight and body condition, whereas cattle supplemented with the low protein treatment lost the most. Although there was little difference between treatment groups in terms of reproductive efficiency and subsequent calf performance, moderate (26% Crude Protein) and high protein supplements appear to offer the most benefit in maintaining cow\weight and body …

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Effect Of Limited - Creep Feeding On Performance Of Spring-Born Calves, D. Simms, Gerry L. Kuhl Jan 1988

Effect Of Limited - Creep Feeding On Performance Of Spring-Born Calves, D. Simms, Gerry L. Kuhl

Kansas Agricultural Experiment Station Research Reports

Three limited-creep feeding trials were conducted with spring-born suckling calves on native grass. The 1696 crude protein, high energy creep feed containing Bovatec® was fed from mid-August to weaning in mid-October. Limited-creep feeding increased (P<.05) calf gains .19 lb per/head/daily with an average daily consumption of 2.15 lb, giving a creep feed-to-gain conversion rate of 11.2.

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Influence Of Sustained Rumensin Release On Steer Performance And Forage Utilization, B. Cochran, E. Vanzant, T. Avery, Jack G. Riley Jan 1988

Influence Of Sustained Rumensin Release On Steer Performance And Forage Utilization, B. Cochran, E. Vanzant, T. Avery, Jack G. Riley

Kansas Agricultural Experiment Station Research Reports

Steers managed within an intensive-early stocking program and receiving Rumensin® via a slow-release bolus tended to have higher average daily gains than steers not receiving Rumensin. However, forage organic matter intake, fill, digestibility, and diet selection showed little response to Rumensin administration.

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Effect Of Ralgro® On Performance Of Steers Grazing High And Low Endophyte Fungus-Infested Tall Fescue Pastures, F.K. Brazle Jan 1988

Effect Of Ralgro® On Performance Of Steers Grazing High And Low Endophyte Fungus-Infested Tall Fescue Pastures, F.K. Brazle

Kansas Agricultural Experiment Station Research Reports

Steers were either not implanted or implanted with 36 or 72 mg of Ralgro, then allowed to graze on both high and low endophyte fungus tall fescue pastures. Ralgro had a greater effect on improving gains of steers grazing high endophyte fungus pastures than on those grazing lowly infected fescue pastures.

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Farm, Wholesale, And Retail Beef Price Relationship, Ted C. Schroeder Jan 1988

Farm, Wholesale, And Retail Beef Price Relationship, Ted C. Schroeder

Kansas Agricultural Experiment Station Research Reports

Analysis of weekly retail, wholesale, and farm beef price data indicated that a time lag exists between price changes at the various market levels. Farm-level slaughter cattle price changes typically lead wholesale beef price changes by 2 to 3 weeks. Similarly, wholesale beef price changes typically lead price changes at the retail level by 3 to 4 weeks.

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Daily Or Weekly Rotational Feeding Of Bovatec®- And Rumensin®/Tylan® To Cattle On A Steam-Flaked Corn Finishing Ration, Robert T. Brandt Jr. Jan 1988

Daily Or Weekly Rotational Feeding Of Bovatec®- And Rumensin®/Tylan® To Cattle On A Steam-Flaked Corn Finishing Ration, Robert T. Brandt Jr.

Kansas Agricultural Experiment Station Research Reports

One hundred sixty-five crossbred steers averaging 823 lb were utilized to evaluate the daily or weekly rotational feeding of ionophores. Treatments were (g/ton of feed, 90% dry basis): 1) Bovatec (B; 30), 2) Rumensin plus Tylan (RT; 25 and 10, respectively), 3) treatments one and two in a daily rotation (D), and 4) treatments one and two in a weekly rotation (W). Steers fed RT consumed less (P<.05) dry matter than B, D>or W steers. No differences (P>.15) in daily gain were observed, suggesting that the increased consumption by B, D) and W steers was accompanied by an al teration in passage rate …

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Feedlot Performance By Steers Fed Sprout-Damaged Milo, K.P. Coffey, Lyle W. Lomas Jan 1988

Feedlot Performance By Steers Fed Sprout-Damaged Milo, K.P. Coffey, Lyle W. Lomas

Kansas Agricultural Experiment Station Research Reports

Forty-eight Charolais crossbred steers were fed sprouted or nonsprouted milo for 139 days in a finishing study. Steers fed sprouted milo (51% sprout damage, 60 lb. per bu.) were 28 lb. heavier (P<.10) and gained 8.4% faster (P<.10) while consuming 2.7% less (P>.10) feed per pound of gain. Sprout damaged milo had no significant (P>.10) effect on carcass characteristics. These data indicate that cattle fed sprouted milo should perform as well or better than those fed nonsprouted milo.

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Incidence Of Pregnancy In Feedlot Heifers At Slaughter, S.B. Laudert Jan 1988

Incidence Of Pregnancy In Feedlot Heifers At Slaughter, S.B. Laudert

Kansas Agricultural Experiment Station Research Reports

Nearly 83,000 heifers were observed at slaughter during 1986 and 1987 to determine their reproductive status. Slightly less than 4 percent were found to be pregnant. Highest incidences of pregnancy were found during the winter months of November through March. Lowest incidences were found during August, September. and October.

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Testing Feedstuffs Using Near-Infrared Reflectance Spectroscopy (Nirs), P.C. Dubois, L.H. Harbers Jan 1988

Testing Feedstuffs Using Near-Infrared Reflectance Spectroscopy (Nirs), P.C. Dubois, L.H. Harbers

Kansas Agricultural Experiment Station Research Reports

Over 16 years ago, an analytical instrument was developed that could rapidly determine the concentration of organic compounds from the spectra produced by the bonding between certain molecules. The instrument is based on the principle that those molecules absorb electromagnetic radiation in the infrared region. Compounds may be quantitated by using a computer to compare absorption bands in the near-infrared spectrum to those from a large calibration set of known composition. Peaks from compounds such as water, protein, fat, and carbohydrate may be translated into nutrient components such as moisture, crude protein, crude fat, acid detergent fiber, etc. all this …

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Double Inseminations And Treatment Of Repeat Breeders With Gonadotropin-Releasing Hormone (1988), Jeffrey S. Stevenson, Edward P. Call, R.K. Scoby, A.P. Phatak Jan 1988

Double Inseminations And Treatment Of Repeat Breeders With Gonadotropin-Releasing Hormone (1988), Jeffrey S. Stevenson, Edward P. Call, R.K. Scoby, A.P. Phatak

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted in one Kansas and five California dairy herds to determine if double inseminations with and without treatment with 100 µg gonadotropinreleasing hormone (GnRH) would improve conception rates of repeat-breeding dairy cattle (n=723). Both lactating cows and virgin dairy heifers were assigned randomly to treatments as repeat breeders, if they had failed to conceive to at least two previous services. Cows inseminated once and treated with GnRH had the best conception rates (41%), which were higher (P<.OI) than those of cows inseminated once without GnRH treatment (32%) and higher (P<.OI) than those of cows inseminated twice without treatment with GnRH (33%). Cattle bred twice that received the GnRH treatment had intermediate rates (37%). We conclude that treatment of repeat breeders with GnRH at the time of insemination (only one service given according to the am-pm, pm-am rule) improved conception rates.; Dairy Day, 1988, Kansas State University, Manhattan, KS, 1988;

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Early Postpartum Luteal Function After Treatment With Progestin And(Or) Gonadotropin-Releasing Hormone In Dairy Cattle (1988), M.O. Mee, Jeffrey S. Stevenson Jan 1988

Early Postpartum Luteal Function After Treatment With Progestin And(Or) Gonadotropin-Releasing Hormone In Dairy Cattle (1988), M.O. Mee, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Progestin (Norgestomet®) and(or) repeated low-dose infusions of GnRH (Cystorelin@) influenced the lifespan of the first corpus luteum after an induced ovulation. Holstein cows (n=32) were assigned at calving to four groups. Cows were treated with blank ear implants (days 2 to 9 after calving) and saline infusion (48 hr on days 10 arid II), progestin ear implants and saline infusion, blank implants and GnRH infusion, or progestin implants and GnRH infusion prior to a GnRH-induced ovulation (day 12). Four primiparous and four multiparous cows were assigned to each treatment. Fewer cows treated with progestin/GnRH ovulated in response to the GnRH …

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