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Articles 481 - 501 of 501
Full-Text Articles in Animal Sciences
A Study Of Bovine Noseprints, Morris W. Hirsch
A Study Of Bovine Noseprints, Morris W. Hirsch
Electronic Theses and Dissertations
The breed association are continuously confronted with the problem of properly identifying animals for registration. The method of identifying the broken color breeds, such as Guernseys, Holsteins, and Ayrshires, is by a sketch of the color patterns which accompanies the application for registration. This has been fairly successful, but due to the poor drawing ability of the applicant approximately twenty percent of animal markings and sketch do not resemble each other to establish identity. The solid colored breeds use brands or tattoo marks in the ear which are not entirely satisfactory since these are artificial and can be applied in …
Influence Of Winter Housing Conditions On Growth Rates And Feed Consumption Of Dairy Heifers, Emery H. Bartle
Influence Of Winter Housing Conditions On Growth Rates And Feed Consumption Of Dairy Heifers, Emery H. Bartle
Electronic Theses and Dissertations
It is important in dairy cattle management to maintain steady and continuous growth of heifers and thereby secure properly developed cows which will give the production that is expected of them when they are brought into the milking herd. In general, heifer calves during the first twelve months of their growing period are carefully managed as to feed, housing and care to promote normal growth. However, they are often neglected during their yearling stage to the point where growth is retarded because of environment factors. On many dairy farms in the North Central States the management of yearling dairy heifers …
A Survey Of The Microflora Obtained By Flushing The Normal Bovine Uterus, Johannah Jane Wulf
A Survey Of The Microflora Obtained By Flushing The Normal Bovine Uterus, Johannah Jane Wulf
Electronic Theses and Dissertations
Since artificial insemination has become a reality and the potentialities of ova transfer are being investigated by several research workers, it seems reasonable to assume that some attention should be directed toward gathering information regarding the bacterial flora of the normal bovine uterus. Both artificial insemination and ova transfer require the insertion of foreign bodies or instruments into the uterus. When such instruments enter this organ, there is always the possibility of introducing various kinds of bacteria. Very little information is available regarding the pathogenicity of these bacteria in the bovine uterus. The possibility of abortion due to such pathogenic …
The Apparent Digestibility By Sheep Of Prairie Hay Harvested At Three Stages Of Maturity, Robert Manseau Jordan
The Apparent Digestibility By Sheep Of Prairie Hay Harvested At Three Stages Of Maturity, Robert Manseau Jordan
Electronic Theses and Dissertations
Grass is the greatest asset of the Northern Great Plains. Grass does and must serve as the basic feed for the flocks and herds of this area. Without grass, much of the Northern Great Plains would be waste land with little or no value. In the states of North and South Dakota, Nebraska, Colorado, Wyoming, and Montana, about 67 per cent of the total land is in pasture and hay. Seventy five to 95 per cent of the total feed needed by cattle and sheep in the Northern Plains states is furnished by pasture and roughage. With an ever-increasing demand …
Systems Of Producing Fat Yearlings For South Dakota, William Clark Mccone
Systems Of Producing Fat Yearlings For South Dakota, William Clark Mccone
Electronic Theses and Dissertations
About twelve billion pounds of dressed beef and veal were produced in the United States in 1947 through the conversion of grassland crops into meat by cattle and these cattle lead all classes of American livestock in the consumption of grass and grassland crops. Grass usually represents the principal and cheapest feed for beef cattle. They utilize about one third of the permanent pastures and three fourths of the range areas. Pastures may be regarded as a costly source of feed only on highly productive farm lands, but their use in rotation with cultivated crops on such land is certain …
The Effect Of Age Of Gilt On Size Of Litter, Clifford Inman Iverson
The Effect Of Age Of Gilt On Size Of Litter, Clifford Inman Iverson
Electronic Theses and Dissertations
Size of litter is an important consideration in determining the profits from a swine production enterprise. Basic information concerning factors affecting litter size is, therefore, pertinent to the swine production industry. This study was conducted to ascertain the effect of age of gilt on the size of their first litters.
The Apparent Digestibility Of Prairie Hay Harvested At Three Stages Of Maturity, Arnold Bernard Nelson
The Apparent Digestibility Of Prairie Hay Harvested At Three Stages Of Maturity, Arnold Bernard Nelson
Electronic Theses and Dissertations
More land in the United States is used for grazing and hay production than for all other farm crops grown. Well-managed pastures and rangeland have always been recognized as an economical source of feed and recently have commanded much attention as an effective means of conserving soil resources and preventing erosion. In the states if North and South Dakota, Nebraska, Colorado, Wyoming and Montana, about 67 per cent of the total land in farms and ranches is in pasture and hay. Over 60 per cent of the entire area of South Dakota and about 83 per cent of the area …
Carcass Differences In Inbred Lines And Linecrosses Of Swine, Ellis Andine Pierce
Carcass Differences In Inbred Lines And Linecrosses Of Swine, Ellis Andine Pierce
Electronic Theses and Dissertations
A great amount of variation in the carcasses from butcher hogs proximal to two hundred and twenty pounds from different lines and breeds has become apparent in recent years. The average hog producer prefers the type of hog that gains quickly and economically and will net the most profit. The average consumer, however, prefers the type of carcass that has a high percentage of lean to fat. Today the dollar value of market hogs is determined more by the amount of finish they are carrying than by the quality of carcass. Since variations do exist in the carcasses from different …
A Survey Of The Rhopalocera Of Jefferson County, Kentucky., Delbert Kenneth Weniger
A Survey Of The Rhopalocera Of Jefferson County, Kentucky., Delbert Kenneth Weniger
Electronic Theses and Dissertations
No abstract provided.
A Study Of Sex Differentiation In Lebistes Reticulatus As Affected By Estradiol Stilbestrol And Pregneninolon., Esther Coogle
A Study Of Sex Differentiation In Lebistes Reticulatus As Affected By Estradiol Stilbestrol And Pregneninolon., Esther Coogle
Electronic Theses and Dissertations
No abstract provided.
The Incidence Of Trichinella Spiralis In The Diaphragms Of Swine From The Louisville Abattoirs., Stuart Lyle Adams
The Incidence Of Trichinella Spiralis In The Diaphragms Of Swine From The Louisville Abattoirs., Stuart Lyle Adams
Electronic Theses and Dissertations
Trichinosis is a disease caused by the parasitic nematode Trichinella spiralis. When meat containing encysted larvae is consumed the cysts are dissolved by the action of the gastric juice in the stomach and the larvae migrate to the intestine where they mature, copulate and give birth to living young within a week of the original infection. The larvae enter the lymph spaces and are carried to the thoracic duct from which they reach the venous circulation and thence the arterial circulation by way of the heart and the pulmonary capillaries. From the arterial blood the larvae enter most of the …
The Efficiency Of Churn Washing Method And The Keeping Quality Of Butter As Indicated By Yeast And Mold Counts, T. Allen Evans
The Efficiency Of Churn Washing Method And The Keeping Quality Of Butter As Indicated By Yeast And Mold Counts, T. Allen Evans
Electronic Theses and Dissertations
Of all the equipment used in the manufacture of butter, no single piece has as close contact with the finished product as does the churn while at the same time no piece of equipment is more difficult to keep properly cleaned. The workers in the dairy industry have expended much time and effort attempting to build a churn which could be kept in a more satisfactory state, especially from a bacteriological point of view. As yet no satisfactory material for churn construction has been found to replace wood which at best is difficult to keep free of micro-organisms. Since it …
The Morphogenesis Of The Pectoral Girdle Of Amblystoma Microstomum., Raymond W. Lawrence
The Morphogenesis Of The Pectoral Girdle Of Amblystoma Microstomum., Raymond W. Lawrence
Electronic Theses and Dissertations
No abstract provided.
A Cytological Study Of The Ciliated Epithelium Of Nucula Castrensis Hinds., Dorothy Blumer
A Cytological Study Of The Ciliated Epithelium Of Nucula Castrensis Hinds., Dorothy Blumer
Electronic Theses and Dissertations
Ever since the latter part of the 17th century, when ciliary movement was first observed, the study of ciliated cells has been of great interest to biologists, particularly to physiologists. In 1713 Leeuwenhoek recorded some observations he made on ciliary activity, using his primitive microscope. A knowledge of the structure and function of ciliated cells is also of importance in that branch of medicine pertaining to disorders of the respiratory passages and the movement of the ovum in the uterine tubes. The bivalve molluscs have come to be the classical example for the study of ciliated cells, both because of …
A Study Of The Relationship Between Blood Flow And Limb Volume In The Hind Limb Of The Dog., J. P. Holt
A Study Of The Relationship Between Blood Flow And Limb Volume In The Hind Limb Of The Dog., J. P. Holt
Electronic Theses and Dissertations
No abstract provided.
The Skeletal, Muscular, Vascular, And The Digestive Systems Of The Ferret (Mustela Putorius) And A Comparison Of These Systems With Those Of The Domestic Cat (Felis Domesticus)., Arthur Pincus Skwerer
The Skeletal, Muscular, Vascular, And The Digestive Systems Of The Ferret (Mustela Putorius) And A Comparison Of These Systems With Those Of The Domestic Cat (Felis Domesticus)., Arthur Pincus Skwerer
Electronic Theses and Dissertations
No abstract provided.
The Anatomy, Systematic Position, Natural History And Economic Importance Of The Spoonbill Ganoid, Polyodon Spathula., Oscar H. Steinberg
The Anatomy, Systematic Position, Natural History And Economic Importance Of The Spoonbill Ganoid, Polyodon Spathula., Oscar H. Steinberg
Electronic Theses and Dissertations
No abstract provided.
The Influence Of Feed And Sunshine On The Vitamin D Content Of Cow’S Milk, Ben L. Robinson
The Influence Of Feed And Sunshine On The Vitamin D Content Of Cow’S Milk, Ben L. Robinson
Electronic Theses and Dissertations
For the past several years there has been a growing tendency among dairymen, particularity those located near the large cities, to keep their cows in the barn much of the time. Under such a system of management the cows receive but little direct sunshine. In some localities it is also possible to find many cows which are fed the year around on dry feed receiving very little, if any, green food, either as soiling crops or as pasture. From many standpoints such practices are, of course, necessary and desirable, but from the standpoint of the nutritional value of the milk …
The Effect Of Potassium-Iodide On The Embryological Development Of The Chick With Special Reference To The Growth Of The Long Bones., David M. Polot 1904-1978
The Effect Of Potassium-Iodide On The Embryological Development Of The Chick With Special Reference To The Growth Of The Long Bones., David M. Polot 1904-1978
Electronic Theses and Dissertations
No abstract provided.
A General Discussion Of Trichinella Spiralis (Owen), An Investigation Of Infection Of The Brown Rat, And A Life History Study Of The Parasite In The White Rat, Carl A. Johnson
Electronic Theses and Dissertations
The purpose of this treatise is threefold: first, to present a general discussion of Trichinella spiralis,; second, to present the results of an investigation of infection with trichinae of 100 brown rats; and third, to present the results of infecting white rats under laboratory conditions.
Comparative Metabolism Of Several Calcareous Minerals In Poultry Feeding, John T. Tripp
Comparative Metabolism Of Several Calcareous Minerals In Poultry Feeding, John T. Tripp
Electronic Theses and Dissertations
In part one of this study it was found that chickens when given oyster shells, in addition to their regular diet, produced a greater number of eggs and eggs of greater shell strength than did the chickens that were given the other calcareous materials used in this experiment. Oyster shell was followed in the order of their effectiveness by clam shells, Black Hills limestone, Nenno chalk stone, and Wisconsin dolomitie limestone.