Evaluation of Nutrient Modeling by SWAT under Tropical Conditions

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

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A simple design and operation for the anaerobic treatment of highly concentrated swine waste in the tropics

Water Science & Technology ◽

10.2166/wst.1995.0466 ◽

1995 ◽

Vol 32 (12) ◽

pp. 91-97 ◽

Cited By ~ 1

Author(s):

P. Y. Yang ◽

M. Kuroshima

Keyword(s):

Treatment Process ◽

Total Solid ◽

Anaerobic Treatment ◽

Solid Content ◽

Total Solid Content ◽

Treatment Processes ◽

Tropical Conditions ◽

Biological Reaction ◽

The Tropics ◽

Small Producers

In order to develop a simple operation for an anaerobic treatment process for highly concentrated pig wastewater for small producers, a three-stage anaerobic treatment process was investigated. The system provided a series of mixing, homogenization, biological reaction and final stabilization of concentrated pig waste (total solid content of 8–10%). The process provided a stable operational performance, simple operational procedure and well stabilized sludge effluent. It was also found that the system is economically feasible in Hawaii. Compared to the other treatment processes for highly concentrated pig waste, this process is considered as an appropriate alternative for the application of the small producers in land limited and tropical conditions. Also, the present treatment system can be easily developed into a prefabricated package plant which can minimize the on-site labor and building costs.

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

Journal of Biological Rhythms ◽

10.1177/0748730420983638 ◽

2021 ◽

pp. 074873042098363

Author(s):

Alejandro A. Aguirre ◽

Roberto A. Palomares ◽

Aitor D. De Ondiz ◽

Eleazar R. Soto ◽

Mariana S. Perea ◽

...

Keyword(s):

Reproductive Performance ◽

Full Moon ◽

Lunar Cycle ◽

The Moon ◽

Crossbred Cows ◽

Lunar Phases ◽

Tropical Conditions ◽

Service Conception ◽

New Moon ◽

Postpartum Estrus

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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Application of air drying technology for helicopter protection in tropical conditions of Vietnam

2020 Applying New Technology in Green Buildings (ATiGB) ◽

10.1109/atigb50996.2021.9423027 ◽

2021 ◽

Author(s):

Hong Phong Nguyen ◽

Vladimir Nikolavich Sereda ◽

Duy Nam Pham ◽

Chi Chinh Vo

Keyword(s):

Air Drying ◽

Tropical Conditions ◽

Drying Technology

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Effects of Stocking and Transport Conditions on Physicochemical Properties of Meat and Acute-Phase Proteins in Cattle

Foods ◽

10.3390/foods10020252 ◽

2021 ◽

Vol 10 (2) ◽

pp. 252

Author(s):

Ahmed A. Abubakar ◽

Idrus Zulkifli ◽

Yong M. Goh ◽

Ubedullah Kaka ◽

Azad B. Sabow ◽

...

Keyword(s):

Physicochemical Properties ◽

Acute Phase ◽

Acute Phase Proteins ◽

Stocking Density ◽

Road Transport ◽

Long Distance ◽

Amyloid A ◽

Tropical Conditions ◽

Meat Samples ◽

Water Holding

This study’s objective was to evaluate the effects of distance and stocking density on physicochemical properties and oxidative stability of meat and acute-phase proteins in Brahman crossbred cattle transported by road under hot and humid tropical conditions. Sixty Brahman crossbred heifers were subjected to road transport from a cattle feedlot farm located in Universiti Putra Malaysia (UPM), Serdang, to a commercial ruminant abattoir in Shah Alam, Selangor. Animals were assigned to long and short distances and high, medium, and low stocking densities. The results revealed that the intensity of response significantly increased in meat samples from animals subjected to long-distance transportation and higher stocking density. Alpha-1-acid glycoprotein and serum amyloid-A values increased considerably and were different from the baseline values recorded at preload. In conclusion, the current results revealed that the color, pH, shear force values, water holding capacity (WHC), glycogen level, and malondilaldehyde assay (MDA) concentrations in meat and acute-phase proteins (APP) were affected by both distances and stocking densities, as evidenced by the significant changes recorded from the parameters above.

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IMPROVEMENT AND ADAPTATION OF THE FAYOUMI CHICKEN

Animal Genetic Resources Information ◽

10.1017/s1014233900000328 ◽

1994 ◽

Vol 14 ◽

pp. 33-39 ◽

Cited By ~ 8

Author(s):

M. A. Hossaryl ◽

E. S. E. Galal

Keyword(s):

Genetic Material ◽

Research Station ◽

Cooperative Society ◽

Tropical Conditions ◽

The Usa ◽

The Creation ◽

The Uk ◽

The 19Th Century ◽

Actual Prevalence

SUMMARYThe Fayoumi (Oasis/Province of Fayotimi) or Ramadi (village of Dar-el-Ramad) breed of chicken is said to have been introduced into this area in the early part of the 19th century; phenotypically it recalls the Silver Campine from which it is reputed to descend. A hardy and well adapted breed it was saved through the creation of the Fayoumi Poultry Research Station in 194é, which also assured an active improvement policy of the breed. The creation in 1958 of the Fayoumi Poultry Cooperative Society further strengthened the conservation of the breed and its use through distribution of genetic material to farmers and smallholders of the Fayoumi province. Since the early é0's the breed is reported to have been successfully introduced to countries as different as the UK and the USA, Vietn@ Iraq, Pakistan and India. Its adaptability and resistance to the problems of xyrotherrnic tropical and sub-tropical conditions is confirmed by its actual prevalence in Southern Egypt.

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