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Kansas Agricultural Experiment Station Research Reports

2002

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Full-Text Articles in Life Sciences

Director's Report Of Research In Kansas 2001, Kansas State University. Agricultural Experiment Station Jan 2002

Director's Report Of Research In Kansas 2001, Kansas State University. Agricultural Experiment Station

Kansas Agricultural Experiment Station Research Reports

This report contains the title, author, and publication information for manuscripts published by station scientists. It also contains a list of the research projects that were active during that period and a financial statement for the fiscal year.

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Kansas Fertilizer Research 2001, Ray E. Lamond Jan 2002

Kansas Fertilizer Research 2001, Ray E. Lamond

Kansas Agricultural Experiment Station Research Reports

No abstract provided.

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Field Research 2002, Dale L. Fjell Jan 2002

Field Research 2002, Dale L. Fjell

Kansas Agricultural Experiment Station Research Reports

No abstract provided.

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Timed Insemination Of Suckled Beef Cows After Ovulation Synchronization With Cosynch + Cidr (2002), Sandra K. Johnson, Keith R. Harmoney, Jeffrey S. Stevenson Jan 2002

Timed Insemination Of Suckled Beef Cows After Ovulation Synchronization With Cosynch + Cidr (2002), Sandra K. Johnson, Keith R. Harmoney, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Lactating beef cows (n=360) were synchronized using the Cosynch procedure; 100 μg of GnRH (day −7) followed in 7 days by 25 mg of PGF2α(day 0). A used intravaginal progesterone insert (CIDR-B) was inserted on day −7 and removed at the time of PGF2αadministration. Cows were assigned to a 2 x 2 factorial arrangement of four treatments: 1) insemination beginning at 48 vs. 60 hours after PGF2αand 2) administration of a second, 100 μg injection of GnRH or an equivalent volume of saline immediately after timed AI. Timed AI at either 48 or 60 hours after PGF2αin a Cosynch + …

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Timed-Insemination Of Beef Heifers Using Cosynch With One Or Two Initial Injections Of Gnrh (2002), David M. Grieger, C.D. Holladay, D.R. Eborn Jan 2002

Timed-Insemination Of Beef Heifers Using Cosynch With One Or Two Initial Injections Of Gnrh (2002), David M. Grieger, C.D. Holladay, D.R. Eborn

Kansas Agricultural Experiment Station Research Reports

Our purpose was to determine if giving an additional injection of GnRH to beef heifers synchronized with the Cosynch protocol would increase pregnancy rate to timed A.I. Eighty yearling beef heifers received an injection of GnRH, 7 days before receiving an injection of PGF (Cosynch). One half of the heifers were also given an injection of GnRH 14 days prior to the PGF injection (2xGnRH-Cosynch). All heifers were given a GnRH injection 2 days after PGF and inseminated at that time. Pregnancy rate for the 2xGnRH-Cosynch group (40%) was not different than that for the Cosynch group (50%) and was …

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Effects Of Cold Shortening And Cooking Rate On Beef Tenderness (2002), D.A. King, T.L. Wheeler, M. Koohmaraie, Michael E. Dikeman, Curtis L. Kastner Jan 2002

Effects Of Cold Shortening And Cooking Rate On Beef Tenderness (2002), D.A. King, T.L. Wheeler, M. Koohmaraie, Michael E. Dikeman, Curtis L. Kastner

Kansas Agricultural Experiment Station Research Reports

A study was conducted to determine if excised, cold-shortened muscle improves in tenderness with refrigerated aging. Changes in muscle tenderness due to cooking rates were also evaluated. Beef ribeye and shoulder clod muscles from the left side of 12 carcasses were removed 45 min postmortem and placed in an ice bath to induce cold shortening. Corresponding muscles from the right side were chilled conventionally on the intact side. One-inch steaks from these muscles were either frozen at 24 hours or aged for 14 days at 40ºF before being cooked and analyzed. Steaks were analyzed raw, or cooked to 160ºF internally …

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Effects Of End-Point Temperature, Reheating, Holding Time, And Holding Temperature On Beef Tenderness (2002), E. Obuz, Michael E. Dikeman Jan 2002

Effects Of End-Point Temperature, Reheating, Holding Time, And Holding Temperature On Beef Tenderness (2002), E. Obuz, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

We cooked steaks from two muscles; outside round (biceps femoris), and strip loin (longissimus lumborum) with an electric belt grill. Biceps femoris steaks had higher Warner-Bratzler shear force (WBSF), connective tissue force (WB Cforce), and myofibrillar force (WB Mforce) values than longissimus lumborum steaks. Holding biceps femoris steaks at 144°F after cooking increased WB C-force (P<0.05) and WB M-force (P<0.01) as compared to holding them at 135°F. Holding biceps femoris steaks for 15 min decreased shear force by 12%, whereas the decrease was only 3% from holding for 30 min, likely because more moisture was lost with the longer holding time. Reheating had the only significant effect on longissimus lumborum steaks' WB measures because low collagen content of this muscle is not affected by holding time or temperature.

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Myofibrillar Structural Changes Caused By Marination With Calcium Phosphate Or Calcium Chloride And Sodium Pyrophosphate (2002), T.E. Lawrence, A.T. Waylan, Curtis L. Kastner Jan 2002

Myofibrillar Structural Changes Caused By Marination With Calcium Phosphate Or Calcium Chloride And Sodium Pyrophosphate (2002), T.E. Lawrence, A.T. Waylan, Curtis L. Kastner

Kansas Agricultural Experiment Station Research Reports

Ultrastructural changes were studied in beef eye of round muscle after 120 hours marination in 0.5, 0.75, or 1.0% calcium phosphate (CaPO) or 2, 4, or 6% calcium chloride or 1% sodium pyrophosphate (CaCl+NaPO) solutions. Increasing the concentration of CaPO caused decreasing myofibril width and increasing myofilament degradation. Increasing the concentration of CaCl+NaPO caused increasing loss of I-band material. Marination of beef eye of round muscle in calcium phosphate or calcium chloride + sodium pyrophosphate solutions caused denaturation of myofibrillar proteins likely due to marinating solution acidity.

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Efficiency Differences In Kansas Beef Cow-Calf Production (2002), L. Stryker, R. Jones, M. Langmeier Jan 2002

Efficiency Differences In Kansas Beef Cow-Calf Production (2002), L. Stryker, R. Jones, M. Langmeier

Kansas Agricultural Experiment Station Research Reports

For the beef industry to be economically competitive with other meat industries, it is essential that individual producers strive for the most efficient, highest quality, least cost production possible. A sample of 26 Kansas beef cow-calf enterprises from the Kansas Standardized Performance Analysis database (SPA) was used to measure efficiency differences among producers, as well as factors contributing toward these differences. On average, farms were 86% technical, 69% economic, and 58% overall efficient. Thus, our results suggest that output could be increased by 14% with optimal technology use, and cost could be decreased by 42% if farms were fully economically …

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Roundup 2002 Jan 2002

Roundup 2002

Kansas Agricultural Experiment Station Research Reports

Roundup is the major beef cattle education and outreach event sponsored by the Agricultural Research Center-Hays. The purpose is to communicate timely, applicable research information to producers and extension personnel. The research program of the Agricultural Research Center-Hays is dedicated to serving the people of Kansas by developing new knowledge and technology to stabilize and sustain long-term production of food and fiber in a manner consistent with conservation of natural resources, protection of the environment, and assurance of food safety. Primary emphasis is on production efficiency through optimization of inputs in order to increase profit margins for producers in the …

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