Browsing Fakultät für Agrarwissenschaften (inkl. GAUSS) by Advisor & Referee "Holtz, Wolfgang Prof. Dr."
Now showing items 1-20 of 21
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Vitrification, warming in sucrose-free medium and transfer of goat and mouse embryos
(2020-05-27)In farm animals, the usage of assisted reproduction programs, implying biotech-nologies such as estrus synchronization, superovulation, cryopreservation of embryos and embryo transfer, to mention some, helps to improve ... -
Control of estrous cycle and superovulation in goats
(2020-05-27)Summary Estrous cycle control is a widely used reproductive biotechnology for controlled breeding of small ruminants. Besides serving the purpose of synchronizing estrus, so that breeding takes place at a particular time, ... -
Terminorientierte Besamung nach Presynch- oder Ovsynch-Behandlung sowie ein Vergleich verschiedener Methoden der Trächtigkeitsfeststellung bei Milchkühen
(2017-10-23)In dairy farming reproductive performance and milk yield of cows have a major impact on the operation’s economic success. As the negative correlation between milk yield and reproductive performance is widely known, the ... -
Development of ovarian germline stem cells in Nile tilapia (Oreochromis niloticus) reared under different temperature regimes
(2017-02-14)Germ cells originate from progenitor cells, denominated as primordial germ cells (PGC). PGC are of extragonadal origin and migrate toward the gonad primordia where they proliferate and, in gonochoristic species, differentiate ... -
Energy metabolism during long-term storage and subsequent thermal stress in liquid preserved boar spermatozoa
(2017-01-16)In major pork producing countries, artificial insemination is used in more than 90 % of breeding sows. Maintenance of good sperm quality during semen preservation is mandatory to ensure high fertility. Boar spermatozoa are ... -
Sperm binding properties to uterine epithelial cells in vitro employing a primary porcine endometrium culture system
(2016-05-24)In pig husbandry the conventional method of intrauterine deposition of an 80-100 ml AI volume containing 1-3 x109 fresh spermatozoa is the commonly used procedure. Compared to bovine insemination, where as little as 2 x106 ... -
Attempts to promote the use of cryopreserved bovine semen: Effect of prostaglandin F2-alpha, sucrose and short-term dry ice storage
(2014-01-09)This dissertation argues that improvement of conception to artificial insemination (AI) through approaches that enhance post-thaw quality of bull semen might sustain enthusiasm for this technology and present a greater ... -
Kryokonservierung von Bullensperma in kleinen Volumina
(2014-01-07)To date in dairy cow breeding, bulls have been assessed by offspring perfor-mance, which resulted in estimated breeding values only after five years (REENTS AND REINHARDT, 2007). By introducing the so called genomic breeding ... -
Pregnancy-associated glycoprotein (PAG) profiles in cows and goats and attempts to measure PAG in milk
(2013-07-09)The aim of the PhD dissertation was to examine the reliability of a PAG polyclonal ELISA developed by Friedrich and Holtz (2010) in goats, different cattle breeds and bovine milk. The dissertation comprised three studies. ... -
Synchronization and Superovulation of Boer Goats with PGF2á and GnRH or hCG and Parentage Analysis using Microsatellite Markers
(2011-08-16)The aim of the first investigation was to devise an efficient protocol for getting a satisfactory embryo yield accomplished by combining the recently established ovsynch protocol with pFSH ... -
Untersuchungen verschiedener Einflussfaktoren auf Gesundheit und Produktivität beim Schaf
(2011-06-06)The breeding of healthy, resistant lambs with good weight gain is most important for shepherds. Basis for this is a good, natural breeding by the ewe, a gentle weaning method and a potential parasite resistance respectively ... -
Helminth infections in laying hens kept in alternative production systems in Germany - Prevalence, worm burden and genetic resistance
(2011-05-11)The aim of this study was to investigate the spectrum and intensity of helminth infections, as well as to estimate seasonal effects on the prevalence and burden of helminths in organic free ... -
Molekulargenetische Untersuchungen zur Verbesserung der männlichen Fruchtbarkeit und Bekämpfung des Erbdefektes Hernia inguinalis/scrotalis in der Schweinezucht
(2010-02-10)Artificial insemination (AI) is a very common and efficient reproduction method in pig breeding. About 90% of all breeding sows in Germany were inseminate by artificial insemination in 2007. ... -
Molekulargenetische und physiologische Untersuchungen zur Vererbung des Erbdefektes Hernia inguinalis/scrotalis beim Schwein
(2009-11-20)Hernia inguinalis/scrotalis (i/s) in pigs are known as congenital defects which occur with a frequency of 1-3% and a heritability of h2 = 0.02 to h2 = 0.86 in German pig breeds and ... -
Open pulled straw vitrification of murine and caprine embryos and timed deep uterine insemination of goats
(2009-07-16)The thesis consists of two sections, the first of which is comprised of two experiments involving the open-pulled-straw (OPS) vitrification method for cryopreserving caprine and murine ... -
Handbuch der monogenen Erbmerkmale beim Hund
(2008-10-01)The objective of the present thesis was to compile all monogenic hereditary diseases and traits whose molecular genetic causes have been identified to date (status quo in October 2007). ... -
Untersuchungen zum Einfluss verschiedener fortpflanzungssteuernder Maßnahmen auf die Fruchtbarkeitsleistung von Jung- und Altsauen unter Großbestandsbedingungen
(2008-04-25)The thesis describes the literature on biotechnological interventions in reproduction and the resulting reproductive performance for large swine farms. The purpose of the investigation was to analyze the role ... -
Experiments to improve the quality of sex-sorted fresh and frozen porcine spermatozoa
(2007-07-10)Experiments to improve the quality of sex-sorted fresh and frozen porcine spermatozoaFor several reasons the demand for sex sorted porcine spermatozoa has been expressed. This includes ... -
Untersuchungen zur Vermeidung des gegenseitigen Besaugens unter Kälbern durch den Einsatz eines Saugnuckels mit erhöhtem Saugwiderstand
(2007-04-11)Cross-sucking is an abnormal behaviour pattern which often occurs in calves reared in group-housed systems. The reason for cross-sucking is seen in the satisfaction deficiency in sucking ... -
Vergleich von Haltungsvarianten für die Einzelhaltung von säugenden Sauen unter besonderer Berücksichtigung der Auswirkungen auf das Tierverhalten und der Wirtschaftlichkeit
(2004-09-29)In the here presented study significant aspects of animal welfare and economy in the farrowing area have been investigated. Three different housing systems have been compared inhere, as ...