Lunar Effect on Thoroughbred Mare Fertility: An Analysis of 14 Years of Data, 1986–1999

Kollerstrom, Nicholas

doi:10.1080/0929-1010400000624

Cited by 11 publications

(3 citation statements)

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“…In addition, previous authors have hypothesized that animals may be influenced by the moon due to changes in geomagnetic fields by increasing sensitivity to magnetoreception with a full moon ( 34 ). The influence of the lunar cycle on animal reproduction has been studied in several species such as cattle ( 35 ), pigs ( 36 ) or horses ( 37 ), however, a lack of knowledge of avian species in this field is evident.…”

Section: Discussionmentioning

confidence: 99%

Effects of meteorology and lunar cycle on the post-thawing quality of avian sperm

Díaz Ruiz,

Delgado Bermejo,

González Ariza

et al. 2024

Front. Vet. Sci.

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IntroductionVarious climatological and lunar cycle parameters have a direct impact on animal reproduction, and in the case of the avian species, spermatozoa are extremely sensitive to heat stress. These parameters could influence sperm freezability, which will ultimately affect post-thawing semen quality, being sperm motility in roosters a relevant indicator of this quality as it is highly related to fertility. Therefore, the objective of the present study is to determine which are the climatological and lunar cycle parameters that have a greater effect on sperm freezability in roosters.MethodsSperm was obtained from 16 Utrerana breed roosters and a total of 27 replicates were performed. A pool was made with those ejaculates that met the minimum quality criteria for each replicate, and four freezing–thawing samples per replicate were analyzed. The straws were thawed, and sperm motility was evaluated, classifying the results obtained into four seminal quality groups according to the guidelines of the Food and Agriculture Organization of the United Nations (Group 1: Good, Group 2: Satisfactory, Group 3: Acceptable but undesirable and Group 4: Unsatisfactory). The following traits were recorded for each day of semen collection: maximum temperature, minimum temperature, maximum barometric pressure, minimum barometric pressure, maximum gust, wind direction, mean wind speed, sunshine hours, rainfall, moon phase, and percentage of illuminated lunar surface over the total area.ResultsA discriminant canonical analysis was performed to determine which of these parameters offered the most information when classifying an ejaculate in each quality group, with minimum temperature, the new moon as moon phase, minimum barometric pressure, and rainfall being the most significant variables.DiscussionAccording to the results obtained, semen quality decreases when temperature and precipitation are lower, pressure is higher, and when there is a new moon phase. Therefore, these environmental conditions should be avoided for sperm collection and processing.

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Section: Discussionmentioning

confidence: 99%

Effects of meteorology and lunar cycle on the post-thawing quality of avian sperm

Díaz Ruiz,

Delgado Bermejo,

González Ariza

et al. 2024

Front. Vet. Sci.

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“…In farm animals, the influence of the lunar cycle on some reproductive events has been described (Horák and Potucek, 1978; Subramaniam et al, 1991; Kollerstrom, 2004; Palacios and Abecia, 2014; Yonezawa et al, 2016; Chinchilla-Vargas et al, 2018). The analysis of 2724 artificial inseminations performed in Churra ewes either after natural estrus detection ( n = 383) or following hormonal treatment ( n = 2341) demonstrated an effect of the lunar phase on conception rate, showing a significant interaction with the type of estrus (Palacios and Abecia, 2014).…”

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confidence: 99%

“…In horses, a 14 years retrospective study (1986-1999; n = 4457) showed a maximum frequency of estrus and conceptions on the full moon and immediately after (Kollerstrom, 2004). Likewise, records of 4149 semen collections from boars of nine different breeds at one boar stud farm demonstrated a moon effect on the volume of ejaculates collected and the number of semen doses per ejaculate (Chinchilla-Vargas et al, 2018).…”

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Lunar Cycle Influences Reproductive Performance of Crossbred Brahman Cows Under Tropical Conditions

Aguirre¹,

Palomares

Ondiz

et al. 2021

J Biol Rhythms

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Evidence has accumulated over the years indicating that the moon influences some aspects of the reproductive activity in animals and humans. However, little is known about the influence of the lunar cycle on the reproductive performance of cows under tropical conditions, where the environment strongly affects reproduction. This retrospective study was conducted with the aim of assessing the influence of the lunar cycle on some reproductive traits of tropical crossbred cows managed in a pasture-based system. Data from 5869 reproductive records from two commercial farms localized in the Maracaibo Lake Basin of Zulia State, Venezuela, were analyzed. Variables studied were first service conception rate, calving frequency, first postpartum estrous frequency, and pregnancy frequency. In addition to the lunar cycle, the effects of farm, season, and predominant breed were also considered. Data were analyzed using logistic regression and general linear model from SAS. First service conception was affected by lunar phases and predominant breed, but not by farm or season. For frequencies of calving, first postpartum estrus, and pregnancy, there was no main effect of farm, season, and predominant breed, whereas the effect of lunar phases was highly significant. First service conception was significantly greater in waning than in crescent phase of the lunar cycle. Frequencies of calving, first estrus, and pregnancy were highly correlated and showed greater figures around full moon and new moon. In conclusion, lunar cycle influenced first service conception, attaining greater values in the waning phase of the moon cycle. Frequencies of calving, first postpartum estrus, and pregnancy in crossbred cows showed a clear bimodal rhythm, whose greatest values coincided with new moon and full moon.

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The lunar cycle: a cue for amphibian reproductive phenology?

2009

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Lunar Effect on Thoroughbred Mare Fertility: An Analysis of 14 Years of Data, 1986–1999

Cited by 11 publications

References 0 publications

Effects of meteorology and lunar cycle on the post-thawing quality of avian sperm

Effects of meteorology and lunar cycle on the post-thawing quality of avian sperm

Lunar Cycle Influences Reproductive Performance of Crossbred Brahman Cows Under Tropical Conditions

The lunar cycle: a cue for amphibian reproductive phenology?

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