Seasonal Changes in the Testicular Size of Grazing Rams
نویسنده
چکیده
Studies over 3 years showed that testicular volume falls during summer and autumn when forage quality and availability decline and when rams are mating. Loss in testicular size may also occur in summer in the absence of mating activity and at a greater rate than loss in live weight. The results suggest that mating and nutrition may override the influence of photoperiod on testicular size and that loss in testicular volume occurs at a time when requirement for semen is at its highest.
منابع مشابه
Determination of copper status of grazing sheep: seasonal influence
A study was conducted to determine the copper status of different classes of grazing sheep during twodifferent seasons on a farm located in southern Punjab, Pakistan. A complete free-choice supplement wasavailable to all animals throughout the year. Soil, forage and blood plasma from animals were taken eighttimes during the year (2005) (four times in both summer and winter seasons). Soil Cu2+ w...
متن کاملPhytoplankton growth and microzooplankton grazing in the Homa Lagoon (İzmir Bay, Turkey)
Phytoplankton growth and microzooplankton grazing were investigated at one station in the Homa Lagoon from February to January in 2006-2007. Our results showed significant seasonal variations in phytoplankton dynamics. Microzooplankton was mainly composed of dinoflagellates and tintinnid ciliates and nauplii. Microzooplankton grazing increased with increasing of temperature. Grazing rate was ma...
متن کاملPhytoplankton growth and microzooplankton grazing in the Homa Lagoon (İzmir Bay, Turkey)
Phytoplankton growth and microzooplankton grazing were investigated at one station in the Homa Lagoon from February to January in 2006-2007. Our results showed significant seasonal variations in phytoplankton dynamics. Microzooplankton was mainly composed of dinoflagellates and tintinnid ciliates and nauplii. Microzooplankton grazing increased with increasing of temperature. Grazing ra...
متن کاملComparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season
This study was conducted to investigate the effects of melatonin implantation on basic testicular characteristics and reproductive performance of Kivircik and Charollais rams and ewes during the nonbreeding season. In this study, 8 Kivircik and 6 Charollais rams were used. Rams were implanted with 54 mg melatonin according to the manufacturer’s instructions. At melatonin implantation and at ram...
متن کاملSeasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman
The contribution of three different cell size classes of picoplankton: 0.74-2 μm, nanoplankton:2–20 μm and microplankton, >20 μm of the phytoplankton population and their relationship to environmental conditions were studied over two annual cycles at one station in Bandar Khyran Bay, Sea of Oman, from May 2006 to August 2008. Nanoplankton was the most important class contributing 54.4% to tot...
متن کامل