Seasonal infertility in Kenyan pig breeding units : research communication

Reproductive performance of 12 Kenyan pig breeding units (56-299 sows per unit) of similar feeding, genetics and health status were evaluated from October 2003 to October 2004 during hot and cooler periods. Sows during cooler months of the year (April to October, average temperature between 08:00 and 17:00: 25.2 + 2.2 °C) had shorter (P < 0.01) weaning to service intervals (7.9 + 2.2 days vs 12.7 + 2.7 days, respectively), less (P < 0.01) regular returns to service (5.7 + 1.9 % vs 9.9 + 1.9 %, respectively), higher (P < 0.01) farrowing rates (80.1 + 4.4 % vs 70.8 + 3.8 %, respectively), and larger born (10.0 + 1.1 vs 9.1 + 1.7, P < 0.05) and weaned litter sizes (9.2 + 1.2 vs 8.0 + 1.3, P < 0.05) compared with the time periods of high ambient temperature (November to March, between 08:00 and 17:00: 37.2 + 3.3 °C). It was concluded that a high ambient temperature is a risk factor for reproductive performance in pig breeding units.

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Loss of potential young in the ewe due to high ambient temperature

Journal of Applied Physiology ◽

10.1152/jappl.1961.16.2.253 ◽

1961 ◽

Vol 16 (2) ◽

pp. 253-256 ◽

Cited By ~ 10

Author(s):

C. W. Alliston ◽

Gene E. Egli ◽

L. C. Ulberg

Keyword(s):

High Temperature ◽

Embryonic Development ◽

Ambient Temperature ◽

Reproductive Performance ◽

Fertilization Rate ◽

High Ambient Temperature ◽

Summer Temperatures ◽

Higher Temperature

Embryonic development and other measures of reproductive performance were compared for 3 years in sheep maintained at 65°F, at prevailing summer temperatures, and at a constant, high temperature (92°F). The concentration and motility of the sperm and the fertility of the semen from control rams declined during periods of high temperature. Fertilization rate was lowered when rams were exposed to high prevailing atmospheric temperatures or ewes to a constant high temperature. A higher percentage of morphologically abnormal ova was recovered from ewes subjected to the higher temperatures. The stages of embryonic development indicated that, in ewes at the higher temperature, a loss of potential young occurs by a cessation of development during cleavage. Submitted on May 6, 1960

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Effects of live yeast dietary supplementation on hormonal profile, ovarian follicular dynamics, and reproductive performance in dairy cows exposed to high ambient temperature

Theriogenology ◽

10.1016/j.theriogenology.2018.08.013 ◽

2018 ◽

Vol 122 ◽

pp. 41-46 ◽

Cited By ~ 2

Author(s):

A.H. Nasiri ◽

A. Towhidi ◽

M. Shakeri ◽

M. Zhandi ◽

M. Dehghan-Banadaky ◽

...

Keyword(s):

Ambient Temperature ◽

Dairy Cows ◽

Reproductive Performance ◽

Dietary Supplementation ◽

High Ambient Temperature ◽

Hormonal Profile ◽

Live Yeast ◽

Follicular Dynamics

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Influence of high ambient temperature on reproductive performance and physiology of rabbit does in a commercial rabbitry in Greece

Journal of the Hellenic Veterinary Medical Society ◽

10.12681/jhvms.15247 ◽

2018 ◽

Vol 54 (2) ◽

pp. 119

Author(s):

E. XYLOURI-FRAGIADAKI (Ε. ΞΥΛΟΥΡΗ-ΦΡΑΓΚΙΑΔΑΚΗ) ◽

E. GOLIDI (Ε. ΓΟΛΙΔΗ) ◽

I. MENEGATOS (Ι. ΜΕΝΕΓΑΤΟΣ) ◽

F. LUZI

Keyword(s):

Mortality Rate ◽

Ambient Temperature ◽

Respiration Rate ◽

Rectal Temperature ◽

Reproductive Performance ◽

High Ambient Temperature ◽

Physiological Traits ◽

Cold Period ◽

Litter Weight ◽

Individual Weight

The reproductive performance and physiological traits of intensively raised does were evaluated under farm conditions in Greece, during the hot (average farm temperature 19.5°C) and cold period (average farm temperature 12.4°C). The size of litter at birth (6.94 vs. 7.84 alive pups, P<0.001), the size of litter at weaning (5.95 vs. 7.06, P<0.001), the pre-weaning mortality rate (16.94% vs. 9.60%, P<0.001, the number of born dead (0.39 vs. 0.19, P<0.001) and the number of stillborn (0,05 vs 0,02 P<0.01) were significantly affected during the hot period, while litter weight and individual weight at birth did not seem to differ between hot and cold period (461 g vs. 466 g (P<0.05) and 68 vs. 65 g (P<0.05), respectively). Rectal temperature of does and respiration rate were higher in the hot period (39.09°C vs. 38.93°C (NS) and 128.08 respirations/min vs. 115.37 respirations/min; P<0.001). The effects of parity order and animals were also studied revealing that parity order influenced significantly total born, born alive, stillborn and weaned rabbits, litter weight and individual weight at birth, as well as the does' respiration rate. The interaction between parity and period was not significant for any of the recorded parameters. In conclusion, high ambient temperature impaired does' reproductive and physiological traits under those conditions, similar to most natural environmental conditions in Greece.

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