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Kansas Agricultural Experiment Station Research Reports

1987

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Full-Text Articles in Life Sciences

How Important Is Extra Solids-Not-Fat In Your Milk? (1987), H.A. Roberts Jan 1987

How Important Is Extra Solids-Not-Fat In Your Milk? (1987), H.A. Roberts

Kansas Agricultural Experiment Station Research Reports

Milk with high solids-not-fat is valuable to the consumer for its flavor and nutritional value and to the manufacturer of milk products, especially relating to cheese yield. Solids-not-fat consists of all solids in milk other than fat. Protein is the most important component of milk because of its nutritional value and its functional properties. Other components, such as milk fat and lactose, also contribute to milk quality and impart certain characteristics to milk products but to a lesser degree.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Periparturient Disorders In Dairy Cows (1987), Jeffrey S. Stevenson Jan 1987

Periparturient Disorders In Dairy Cows (1987), Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

The economic climate in the dairy industry requires producers to operate efficiently to remain competitive. Attention to details and understanding of reproduction, metabolism, digestive functions, milk secretion, and all aspects of husbandry are essential. To be successful, producers must minimize reproductive failure because reproductive performance affects the quantity of milk produced per cow per day of herd life, the number of potential replacements needed to maintain a constant herd size, and the longevity of the cow in the herd. In practice, this translates into well-designed programs of herd health, milking, feeding, and reproductive management that minimize involuntary culling of. problem …

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Feeding And Managing Early Lactation Cows (1987), James R. Dunham Jan 1987

Feeding And Managing Early Lactation Cows (1987), James R. Dunham

Kansas Agricultural Experiment Station Research Reports

Feeding and managing dairy cows during the prepartum and early lactation periods have more effect on total lactation yields than all other factors. It is during this time that the pattern of milk production is established for the entire lactation. The full production potential of high producing cows cannot be realized unless these periods are given special consideration.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Effect Of Production On Reproduction (1987), Edward P. Call Jan 1987

Effect Of Production On Reproduction (1987), Edward P. Call

Kansas Agricultural Experiment Station Research Reports

The genetic antagonsim that exists between production and reproduction is overcome by sound management practices. Kansas Holstein herds were ranked by quartile and analyzed by comparing various reproductive traits. Higher producing herds suffered less reproductive loss based upon the factors considered. The most significant differences concerned the average days dry, average days open on cows not yet serviced, percent of cows open more than 120 days since fresh, and average age at first calving. An adequate record system will identify potential reproductive problems, and a sound Preventive Herd Health Program (PHHP) will minimize actual losses from disease and cows not …

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Concentrations Of Progesterone And Conception Rates In Holstein Heifers After Hcg Administration During The First 3 Weeks After Estrus (1987), R.E. Stewart, M.O. Mee, Jeffrey S. Stevenson Jan 1987

Concentrations Of Progesterone And Conception Rates In Holstein Heifers After Hcg Administration During The First 3 Weeks After Estrus (1987), R.E. Stewart, M.O. Mee, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

We conducted two experiments to determine the effects of administering human chorionic gonadotropin (hCG) on day 4 or on days 15, 16, and 17 after estrus on conception rates and progesterone secretion by the corpus luteum in Holstein heifers. In the first experiment, 60 heifers received hCG or saline on day 4 after estrus and AI. Conception rates were similar between groups. Concentrations of progesterone were increased in treated pregnant and nonpregnant heifers 7 and 14 days after treatment compared with pregnant and nonpregnant controls. In the second experiment, 62 heifers received hCG or saline on days 15, 16, and …

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Gonadotropin-Releasing Hormone Improves Conception Rates Of Repeat-Breeders With Previous Reproductive Disorders (1987), Jeffrey S. Stevenson, Edward P. Call Jan 1987

Gonadotropin-Releasing Hormone Improves Conception Rates Of Repeat-Breeders With Previous Reproductive Disorders (1987), Jeffrey S. Stevenson, Edward P. Call

Kansas Agricultural Experiment Station Research Reports

An experiment examining the benefit of treating repeat-breeders with 100 µg GnRH (Cystorelin ®) at the time of third or fourth insemination was conducted in 513 dairy cows of which 93 (abnormal cows) had been diagnosed previously (during the 60 to 90 days postpartum) as having reproductive disorders, including retained placenta, uterine infections, prolonged anestrus, and cystic ovaries. Treatment with GnRH improved conception in normal and abnormal repeat-breeding cows by 13 percentage points or 42%.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Influence Of Prebreeding Progesterone Plus Prostaglandin F2-Α On Estrus And Fertility In Lactating Dairy Cows (1987), M.O. Mee, R.E. Stewart, Jeffrey S. Stevenson, Edward P. Call Jan 1987

Influence Of Prebreeding Progesterone Plus Prostaglandin F2-Α On Estrus And Fertility In Lactating Dairy Cows (1987), M.O. Mee, R.E. Stewart, Jeffrey S. Stevenson, Edward P. Call

Kansas Agricultural Experiment Station Research Reports

Progesterone administered before breeding may increase estrous expression and subsequent fertility in lactating dairy cows. Holstein cows (n=302) were assigned randomly at calving to three groups. Cows received no treatment (controls), one injection of prostaglandin F 2-α (PGF), or progesterone plus one injection of PGF (PRID + PGF). The average interval to estrus was 5 days shorter in PRID + PGF cows compared to cows given only PGF. In addition, more cows were observed in estrus 2 to 5 days after treatment in the PRID + PGF group compared to the PGF group. Average days from calving to conception were …

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Further Studies Utilizing Hormones To Alter Estrous Cycles And Fertility (1987), Jeffrey S. Stevenson, R.E. Stewart, Edward P. Call Jan 1987

Further Studies Utilizing Hormones To Alter Estrous Cycles And Fertility (1987), Jeffrey S. Stevenson, R.E. Stewart, Edward P. Call

Kansas Agricultural Experiment Station Research Reports

In one large dairy herd, we examined the reproductive performance of 943 cows following early postpartum hormonal therapy utilizing gonadotropin-releasing hormone (GnRH or Cystorelin®) and prostaglandin F2-α (PGF). None of our hormonal treatments improved reproductive efficiency in this herd, whereas earlier studies at the KSU Dairy Teaching and Research Center had proved beneficial. However, cows given PGF to induce estrus at the beginning of the breeding period had similar reproductive performance to control cows, suggesting a potential use for one injection of PGF to allow the breeding of more cows by a target date after calving (e.g., by 65 days).; …

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Performance Of Early Weaned Calves Fed Lasalocid (1987), K.L. Anderson, Tiruvoor G. Nagaraja, J.L. Morrill, P.G. Reddy Jan 1987

Performance Of Early Weaned Calves Fed Lasalocid (1987), K.L. Anderson, Tiruvoor G. Nagaraja, J.L. Morrill, P.G. Reddy

Kansas Agricultural Experiment Station Research Reports

Twenty-two newborn, bull calves were used to determine the effects of lasalocid on growth and feed intake of early-weaned calves from week 1 to 12. Calves were assigned to lasalocid or control groups on day 3. Lasalocid-fed group received lasalocid in milk from day 4 to 7 and in milk and pre-starter from days 7 to 14 and in starter feed from weeks 2 to 12. Lasalocid-fed calves had a significantly higher feed consumption and greater weight gain than calves that did not receive lasalocid. The difference became apparent only after 6 wk of age. Lasalocid appears to be a …

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Effect Of Supplemental Potassium And Buffer In Starters For Early-Weaned Calves (1987), P. Flynn, J.L. Morrill, P.G. Reddy, James J. Higgins Jan 1987

Effect Of Supplemental Potassium And Buffer In Starters For Early-Weaned Calves (1987), P. Flynn, J.L. Morrill, P.G. Reddy, James J. Higgins

Kansas Agricultural Experiment Station Research Reports

Sixty Holstein heifers were used from birth to 8 weeks of age to study the effect of amount of potassium (K) in the diet and of adding a buffer to the starter. Starters were formulated with and without 1% trona, a natural ore buffer, at K concentrations of .9, 1.25, and 1.5% of the dry matter. To supply adequate fiber, yet allow formulation of the starter containing .9% K, 20% prairie hay was included. All calves were fed milk and a prestarter, using an early weaning procedure. Growth and feed consumption data and evaluation of health and metabolic activity were …

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Use Of Extruded Soy Flour In Milk Replacers For Calves (1987), D.P. Dawson, J.L. Morrill, P.G. Reddy, Keith C. Behnke Jan 1987

Use Of Extruded Soy Flour In Milk Replacers For Calves (1987), D.P. Dawson, J.L. Morrill, P.G. Reddy, Keith C. Behnke

Kansas Agricultural Experiment Station Research Reports

Oil-extracted, desolveritized soy flour without additional heat treatment was used to prepare protein supplements for calf milk replacers by extrusion processing. Various combinations of temperature, moisture, calcium concentration, sulfur, and acid were used to prepare 32 different products. These products were tested for trypsin inhibitor and antigenic activity and the most promising one was chosen for further testing. This product alone or with supplementary amino acids or amino acids and citric acid was used to provide 70% of the protein in experimental milk replacers. These replacers were compared to an all-milk replacer, using growth and metabolic responses of young Holstein …

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Effect Of Ruminal Protozoa On Performance Of Early-Weaned Calves (1987), K.L. Anderson, Tiruvoor G. Nagaraja, J.L. Morrill, P.G. Reddy Jan 1987

Effect Of Ruminal Protozoa On Performance Of Early-Weaned Calves (1987), K.L. Anderson, Tiruvoor G. Nagaraja, J.L. Morrill, P.G. Reddy

Kansas Agricultural Experiment Station Research Reports

Twenty newborn bull calves assigned to two groups, protozoa-free or protozoa-inoculated, were used to determine the effects of ruminal protozoa on performance of early weaned calves. Calves in the protozoa group were inoculated via stomach tube with a suspension of ruminal protozoa at weekly intervals until a viable population was established. Calves were evaluated weekly for weight gain and feed intake. Feed intake and weight gain were not significantly different between the groups but tended to be higher in protozoa-inoculated than protozoa-free calves.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Evaluation Of A Calf Starter Supplement (1987), J.L. Morrill, P.G. Reddy Jan 1987

Evaluation Of A Calf Starter Supplement (1987), J.L. Morrill, P.G. Reddy

Kansas Agricultural Experiment Station Research Reports

An experimental calf starter made from a pelleted commercial type supplement and feeds readily available on the farm was compared to a conventional pelleted calf starter in an attempt to demonstrate an economical alternative to commercial calf starter. Calves fed the experimental starter consumed as much starter and gained as much weight as calves fed the conventional starter, thus demonstrating a potential for savings on feed cost. The project is continuing in an attempt to improve the starter composition.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Glucose, Starch, And Dextrin Utilization In The Small Intestine Of Steers (1987), K.K. Kreikmeier, D.L. Harmon, T.B. Avery, Robert T. Brandt Jr. Jan 1987

Glucose, Starch, And Dextrin Utilization In The Small Intestine Of Steers (1987), K.K. Kreikmeier, D.L. Harmon, T.B. Avery, Robert T. Brandt Jr.

Kansas Agricultural Experiment Station Research Reports

Holstein steers (775 lbs) were surgically fitted with abomasal and ileal cannulae, portal and mesenteric venous catheters, and an elevated carotid artery. These steers were used to study starch digestion in the small intestine. Glucose, corn starch, and corn dextrin were infused into the abomasum at various levels and ileal digesta samples were collected. Disappearance of carbohydrate (CHO) in the small intestine was determined using Cr:EDTA as an indigestible marker. Blood samples were collected from the portal vein and carotid artery during carbohydrate infusion. Blood flow was determined, and net glucose absorption across the small intestine was calculated. Glucose infusions …

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Relative Feeding Value Of Three Forage-Based Diets For Holstein Heifers (1987), John E. Shirley, J.L. Morrill, W.H. Carinder Jan 1987

Relative Feeding Value Of Three Forage-Based Diets For Holstein Heifers (1987), John E. Shirley, J.L. Morrill, W.H. Carinder

Kansas Agricultural Experiment Station Research Reports

Soybeans interseeded with grain sorghum and harvested as a mixed forage silage crop can be used successfully as a feed for growing dairy heifers. However, daily gain is greater when grain sorghum silage plus alfalfa hay or prairie hay supplemented with milo grain and soybean meal is fed.Replacement heifer programs should be cost effective but yield a heifer large enough to be bred to calve by 24 months of age and with a well developed mammary gland relatively free of internal fat. A daily gain of 1.6 to 1.8 lbs appears to be optimum to achieve the desired bodyweight to …

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Usda-Dhia Sire Summaries-Ai Advantage (1987), Edward P. Call Jan 1987

Usda-Dhia Sire Summaries-Ai Advantage (1987), Edward P. Call

Kansas Agricultural Experiment Station Research Reports

USDA-DHIA Sire Summaries are published semiannually and provide the dairy industry with an accurate evaluation of the transmitting ability of bulls for milk and milk components. Genetic potential is established at the time of conception. Therefore, current service sires represent the primary means of improving the genetic base of the future herd. Based upon first evaluation of daughters of AI and non-AI bulls, the data clearly indicate the genetic superiority of bulls selected by the AI industry. Dairy producers are strongly urged to select service sires from the Active AI bull listings.; Dairy Day, 1987, Kansas State University, Manhattan, KS, …

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Early Lactation Somatic Cell Count Should Be Low (1987), James R. Dunham Jan 1987

Early Lactation Somatic Cell Count Should Be Low (1987), James R. Dunham

Kansas Agricultural Experiment Station Research Reports

Cows and heifers in milk for fewer than 50 days, as shown on the DHIA Somatic Cell Count report, should have a lower average Somatic Cell Count than cows in milk for more than 300 days, if the dry cow mastitis treatment and management programs are effective. The DHIA Somatic Cell Count (SCC) average for a dairy herd is a good evaluation of a mastitis control program. Since leucocytes migrate to the mammary system during periods of subclinical mastitis, the SCC average indicates the amount of subclinical mastitis in a herd. A realistic goal for a herd average SCC is …

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Update On Gonadotropin-Releasing Hormone Treatments For Repeat Breeders (1987), Jeffrey S. Stevenson Jan 1987

Update On Gonadotropin-Releasing Hormone Treatments For Repeat Breeders (1987), Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

In three of six studies involving over 1,650 cows, treatment of lactating dairy cows with 100 µg GnRH (2 cc Cystorelin®) at the time of third or fourth insemination improved conception rates by 12 percentage points. When all six studies are considered, rates improved by 10 percentage points. These data provide strong evidence for continued use of GnRH at the time of insemination for repeat breeders.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

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Cow-Side Milk Progesterone Testing, Edward P. Call, Jeffrey S. Stevenson Jan 1987

Cow-Side Milk Progesterone Testing, Edward P. Call, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Cow-side milk progesterone tests are effective in determining the presence of an active corpus luteum (CL) on the ovary. The test is best used as an adjunct to the Preventive Herd Health Program (PHHP) as a means of identifying cows that have not yet been detected in heat and are candidates for synchronization with prostaglandin (PGF). Several test kits are on the market, and all involve similar chemical principles. However, each test has its own protocol, so read and follow directions EXACTLY. A "control" or "sample" must be run with each test for comparison.; Dairy Day, 1987, Kansas State University, …

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Comparative Feeding Value Of Grain Sorghum And Corn In Beef Cattle Diets, G. Goldy, K. Bolsen, Jack G. Riley Jan 1987

Comparative Feeding Value Of Grain Sorghum And Corn In Beef Cattle Diets, G. Goldy, K. Bolsen, Jack G. Riley

Kansas Agricultural Experiment Station Research Reports

Homozygous yellow endosperm grain sorghum had no advantage in feeding value over heterozygous yellow endosperm hybrids (P>.05). A heterozygous yellow endosperm hybrid, Funk's 550, had larger kernels (P<.001) and when dry rolled, produced more fine particles (P<.01). This may explain its trend toward improved feed efficiency, higher DM digestibility, and greater in vitro VFA production compared with the other dry processed grain sorghum hybrids tested. Our results do not support the traditional 12 to 16% price discount for grain sorghum relative to corn.

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Feeding Value Of Wheat And Sorghum Grain As Indicated By Absorbed Nutrients, K.L. Gross, D.L. Harmon, T.B. Avery Jan 1987

Feeding Value Of Wheat And Sorghum Grain As Indicated By Absorbed Nutrients, K.L. Gross, D.L. Harmon, T.B. Avery

Kansas Agricultural Experiment Station Research Reports

Steers fed diets based on dry-rolled wheat or sorghum grain alone or combined (50:50) showed no differences in net portal fluxes of glucose, L-lactate, ammonia, urea, or α-amino nitrogen. Portal blood flow was increased in steers fed the 50:50 diet. Total volatile fatty acid flux into the portal blood tended to be lower for steers fed the sorghum grain diet, which may partially explain the lower feeding value of sorghum grain compared to wheat or the two grains combined.

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Detection Of Elastin, Collagen, And Cartilage Particles In Ground Beef By Enzyme Digestion And Sensory Analysis, G. Whipple, J.B. Axe, S. Goll, Curtis L. Kastner Jan 1987

Detection Of Elastin, Collagen, And Cartilage Particles In Ground Beef By Enzyme Digestion And Sensory Analysis, G. Whipple, J.B. Axe, S. Goll, Curtis L. Kastner

Kansas Agricultural Experiment Station Research Reports

An enzyme digestion technique was developed using a proteolytic enzyme concentrate to quantitate connective tissue particles in ground beef samples, which had been formulated to contain various amounts of connective tissue. Replicate samples were also evaluated by a taste panel to quantify detectable connective tissue particles. Results for the laboratory enzyme technique and the taste panel were highly correlated. Therefore, the enzyme digestion technique can be used to estimate total connective tissue in ground beef and those particles that are detected upon chewing.

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Effect Of Sprouting And Weather Damage On Feeding Value Of Grain Sorghum (Summary Of Beef, Swine, And Poultry Trials), H. Turlington, G. Allee, Jack G. Riley, Ronald V. Pope Jan 1987

Effect Of Sprouting And Weather Damage On Feeding Value Of Grain Sorghum (Summary Of Beef, Swine, And Poultry Trials), H. Turlington, G. Allee, Jack G. Riley, Ronald V. Pope

Kansas Agricultural Experiment Station Research Reports

Grain sorghum officially graded as 39% damaged (sprouted) with 10% broken kernels or foreign material was fed to beef steers, growing swine, and broilers to compare its feeding value to that of normal grain sorghum. Damaged grain constituted 0, 50, or 100% of the grain portion of the rations. Cattle performance during a 57-day finishing period was not reduced by feeding sprouted grain sorghum. However, the swine and broiler trials suggest that sprouted grain sorghum has a slightly lower energy value.

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Color Formation And Retention In Fresh Beef, Donald H. Kropf, Melvin C. Hunt, D. Piske Jan 1987

Color Formation And Retention In Fresh Beef, Donald H. Kropf, Melvin C. Hunt, D. Piske

Kansas Agricultural Experiment Station Research Reports

We conducted two studies in response to a severe problem with ground beef color encountered by beef fabricators and retailers. We concluded that: (1) Loss of muscle chemical-reducing capability upon grinding, with subsequent color deterioration, results from both the mechanical effect of grinding and incorporation of oxygen into the beef. (2) Flat, thin, surface muscles from beef carcasses retain more ability to bloom (turn bright red) if they are removed by hot boning or after a relatively short chill period.

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Measurement Of The Binding Properties Of Meat Used In Restructured Beef Products, S.J. Goll, Curtis L. Kastner Jan 1987

Measurement Of The Binding Properties Of Meat Used In Restructured Beef Products, S.J. Goll, Curtis L. Kastner

Kansas Agricultural Experiment Station Research Reports

The dried weight of the material washed from meat surfaces by distilled water closely paralleled the binding strength between meat particles as measured by tensile strength testing. Sponges added to meat pieces during mixing were a poor estimation of protein extraction and binding strength.

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Factors Predicting The Probability Of Estrus And Pregnancy, T. Goehring, L. Corah, James J. Higgins Jan 1987

Factors Predicting The Probability Of Estrus And Pregnancy, T. Goehring, L. Corah, James J. Higgins

Kansas Agricultural Experiment Station Research Reports

A statistical analysis was used to determine which live animal traits are useful in predicting reproductive performance in first-calf heifers. Heifer condition score at calving and change in condition score postcalving, calving difficulty score, and milk production were related to the probability of estrus and pregnancy. Condition score at calving had the greatest impact and, to a great extent, moderates the influence of the other traits.

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Effects Of Energy Level And Lasalocid On Productivity Of Fall-Calving, First-Calf Heifers, T. Goehring, L. Corah, James J. Higgins Jan 1987

Effects Of Energy Level And Lasalocid On Productivity Of Fall-Calving, First-Calf Heifers, T. Goehring, L. Corah, James J. Higgins

Kansas Agricultural Experiment Station Research Reports

Fall-calving, first-calf heifers (136 head) were fed TDN levels approximating 85% or 100% of NRC recommendations, with or without 200 mg/hd/day lasalocid. Those fed the recommended diet gained more weight from 130 days prepartum to calving and showed more improvement in condition score before calving than those on the low-energy diet. After calving, the group fed the recommended energy level lost less weight and condition and had better reproductive performance than the low-energy group. The only effect of lasalocid was to improve calf performance in the low-energy group.

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Relationship Of Age At Puberty And Postpartum Interval To Estrus In Angus X Hereford And Brahman X Hereford Females, D.J. Patterson, L.R. Corah, J.R. Brethour, W.R. Negus Jan 1987

Relationship Of Age At Puberty And Postpartum Interval To Estrus In Angus X Hereford And Brahman X Hereford Females, D.J. Patterson, L.R. Corah, J.R. Brethour, W.R. Negus

Kansas Agricultural Experiment Station Research Reports

Records of age at puberty (AAP) and postpartum interval to estrus (PPI) for heifers calving first at 2 years of age were used to determine the relationship between the two reproductive parameters. In Brahman x Hereford (BxH) females, there was no relationship between AAP and PPJ. In Angus x Hereford (AxH) females, PPI increased as AAP decreased. The data suggest that heifers heavier at weaning reach puberty younger, but PPJ may be longer following their first calving. Heifers larger at weaning may need to be managed differently to improve performance during the first postpartum period.

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Whole-Plant Forage And Grain Sorghum Silages For Growing Cattle, B. Kirch, S. Hamma, K. Bolsen, H. Ilg, J. Hoover Jan 1987

Whole-Plant Forage And Grain Sorghum Silages For Growing Cattle, B. Kirch, S. Hamma, K. Bolsen, H. Ilg, J. Hoover

Kansas Agricultural Experiment Station Research Reports

Four trials were conducted to determine the feeding value of whole-plant forage and grain sorghum silages. In general, growing cattle fed grain sorghum hybrids (NK2778, Funk's 550, DeKalb 42Y, DeKalb E67) out performed those fed forage sorghum silages. Only moderate to high grain-content, forage sorghums (Buffalo Canex, Pioneer 947, Acco 351) gave performances that approached the grain sorghums. Low grain-content and nonheading forage sorghums (DeKalb 25E, Funk's G-1990) resulted in the poorest cattle performance. These studies indicate that grain content of a sorghum silage is the major determinant of cattle performance and that whole-plant grain sorghums should produce the fastest …

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Additive-Treated Corn Silages For Growing Cattle, K. Bolsen, H. Ilg, B. Kirch, A. Laytimi, Lyle W. Lomas Jan 1987

Additive-Treated Corn Silages For Growing Cattle, K. Bolsen, H. Ilg, B. Kirch, A. Laytimi, Lyle W. Lomas

Kansas Agricultural Experiment Station Research Reports

Whole-plant corn silages were treated with USO3M or Silo-Best Soluble® in one trial and with Garst M-74® in a second trial. In Trial 1 all three silages were well preserved and moderately stable in the air. USO3M silage lost less dry matter during fermentation than control or Silo-Best silages. Cattle fed the USO3M silage made 7.6% faster gains and were 5.2% more efficient than those fed the control silage. Cattle performance with the Silo-Best Soluble and control silages was similar. In trial 2, heifer gains were nearly identical for both control and Garst M-74 silages.

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