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Bayemi P. H. Leinyuy I. Nsongka V. M. Webb E. C. Ebangi A. L. 《Tropical animal health and production》2010,42(8):1779-1783
A study was carried out to evaluate the viability of extended cattle semen, without freezing, under different storage conditions.
The semen was collected from Holstein Friesian bulls using artificial vaginas. The semen was extended and stored in a 3-by-4
factorial design (storage system × ice change). The storage media were ice boxes, buckets, and refrigerator. The ice in these
media was either replaced daily, on the first and third day, first day only, or no ice at all after the semen collection.
Results showed an overwhelming evidence of the effect of storage medium and ice change on sperm viability (P < 0.0001). Individual motility before processing was highest in the refrigerator with averages of 44.5%, 39.5% in ice boxes,
and 10% in buckets during the 8-day experiment. There was no significant difference (P > 0.05) in progressive motility after processing in the refrigerator (34%) and in ice boxes (33%) but significantly higher
(P < 0.01) to the 10% obtained in buckets. It was shown that spermatozoa in the ice box retained 45% individual motility up
to the sixth day after semen was collected on the condition that the ice was changed on the third day. Progressive motility
after processing in the ice box was 40% up to the sixth day with the ice changed on the third day while the spermatozoa were
well preserved up to the fourth day in the same medium if the ice put on the first day was not changed. This study shows that,
if farmers plan to inseminate cows within the first day after semen collection, they can use buckets with ice for the transportation
of the extended semen ampoules from the artificial insemination center. Otherwise, the semen needs to be kept in ice boxes
and the ice changed on the third day after collection and this semen could be used within a week. 相似文献
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Characterization of Doayo and Kapsiki taurine cattle breeds of Cameroon in their natural environment
Data were collected on live weight (LW), heart girth (HG), height-at-withers (HW), trunk length (TL), age, sex, and coat color
of 207 taurines cattle—122 of the Doayo (Namchi) breed and 85 of the Kapsiki (Kirdi) breed. The animals, aged 1 to 20 years,
were selected from 60 herds randomly selected from villages of Poli of Faro and Mokolo of Tsanga, divisions of the North and
Far North Regions of Cameroon. The data were analyzed using the SAS program with a linear model, applying standard tests.
Results indicated no breed effect (P > 0.05) in the growth trends of LW, HG, HW, and TL. HG and TL were highly significantly (P < 0.0001) related to LW. The growth pattern for the two breeds was the same since the linear contrast of least square means
for the traits at various age groups did not differ (P > 0.05) significantly. The breeds attained maturity as from 4 years. In the absence of breed effect (P > 0.05), a single regression equation was established for the estimation of live weight as thus LW = - 244.42 ( ±22.57 ) kg + 2.49 ( ±0.23 ) HG + 1.04 ( ±0.25 ) TL {\hbox{LW}} = - {244}.{42 }\left( {\pm {22}.{57}} \right){\hbox{ kg}} + {2}.{49 }\left( {\pm 0.{23}} \right){\hbox{ HG}} + {1}.0{4 }\left( {\pm 0.{25}} \right){\hbox{ TL}} , with HG contributing up to 70% of total variation and TL, 2%. This equation could be used to develop a measuring band useful
in the rural environment for commercial and clinical veterinary purposes. 相似文献
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