2013, Number 2

Journal of Animal and Poultry Sciences (JAPSC)

Vol 2(2), 2013

Effect of cholecalciferol (D3) replacement with 1alpha-hydroxycholecalciferol on broiler breeder hen’s performance

M. Mottaghitalab*, M. Hormozdi, and A. Kamyab

39-47

Abstract

This experiment was carried out to compare the effects of 1α-hydroxy cholecalciferol replacement with cholecalciferol on broiler breeder hen’s performance. 288 Ross”308″ broiler breeder hens at 57 weeks of age were allocated to a randomized complete design with six treatments and four replication of twelve females and 1 male each. Treatments include: 3500 IU/kg vitamin D3 (T1), 3340 (T2), 3300 (T3), 3260 and 3180 IU D3 (T5). The incomplete levels of the vitamin D3 in T2, T3, T4 and T5 supplemented by adding 1α(OH)D3 to the diets at levels 10, 12.5, 15 and 20 gr/ton, respectively and treatment with no D3 supplementation. Results showed, compared to lower levels of the same metabolites and also as compared with the hens fed D3, significant reduction in egg production when 20 g/Ton 1α(OH)D3 was added in diet; however, no differences were observed in egg weight, egg specific gravity, hatchability, early, middle and late embryo mortality and piped egg, plasma calcium and phosphorous concentration and tibia ash between treatments supplemented with combination of vitamin D3 and 1α(OH)D3 as compared with D3. The hens fed diet without supplement vitamin D showed significant decrease in egg production and egg mass, egg specific gravity, hatchability and significant increase in feed conversion ratio and early and late embryonic mortality, without any effect on other traits. In conclusion, replacement of 1α(OH)D3 with D3 in broiler breeder diets have no beneficial effect on egg production, egg shell quality and hatchability. It seems, that hens are able to metabolize sufficient 1, 25(OH)2D3 from dietary vitamin D3 to meet requirement.

Key words: 1α-hydroxycholecalciferol, Broiler breeder, Vitamin D

 
 

The Use of Phytase and Low Phosphorus Levels in Broiler Diets with Different Metabolizable Energy Levels

M. Beiki*, S. M. Hashemi, and A. Yaghoobfar

48-54

Abstract

The objective of this study was to determine the effects of dietary available phosphorus (AP), phytase supplementation and metabolizable energy (ME) levels on performance and bone and blood characteristics of broiler chickens. An experiment in completely randomized design with 2 × 2 × 2 factorial arrangement were conducted, in which two phytase levels (0 and 500 mg/kg), two AP levels (NRC and 15% lower) and two ME levels were used. The ME ratios to CP and other nutrients (except phosphorus) were equal in all treatments. Average weight gain, feed intake, and feed conversion ratio (FCR) of starter, grower and total rearing period were analyzed. Bone calcium and phosphorus, blood calcium, phosphorus and alkaline phosphatase at 6 weeks of age were analyzed. Based on growth parameters, low AP level had equal or better effects than high AP level. Chickens fed diets with high ME levels had better performance. Phytase had no significant effects on weight gain, whereas it enhanced FCR. Adding phytase in low energy diets improved body weight gain and FCR. Phytase in diets with low AP levels significantly enhanced FCR. Using low AP in high and low energy diets, caused better FCR in starter and whole rearing phase consequently. Available phosphorus and phytase supplementations had no significant effects on tibia ash; however, it was inversely affected by low AP level. The results of this experiment indicated that it is possible to decrease dietary AP level up to 15 percent less than NRC recommends. Adding AP and phytase did not significantly affect growth parameters of the chicks fed low energy diets.

Key Words: Available Phosphorus, Metabolizable energy, Phytase, Broiler

 

  

Timing of feeding orchestrates circadian post-feeding intake rhythms in once-daily fed dairy cows

A. Nikkhah

55-60

Abstract

The objective was to establish effects of feed presentation time and dietary forage to concentrate ratio on circadian postprandial rhythms of feed intake in lactating cows. Four multiparous and four primiparous Holstein cows were fed in a 4 × 4 Latin square design (with a 2 × 2 factorial arrangement of treatments) a higher (HC, forage to concentrate ratio = 38.5:61.5) or a lower (LC, forage to concentrate ratio = 50.6:49.4) concentrate total mixed ration (TMR) at either 21:00 h or 09:00 h. A metabolic acquisition system was used to monitor continuous feed intake electronically. Feeding at 21:00 h vs. 09:00 h increased feed intake within 3 h post-feeding, from 26 to 37% of total daily intake; with daily dry matter intake remaining unchanged. Results establish that evening instead of morning feeding increased eating rate shortly post-feeding, and thus, is a key regulator of postprandial circadian intake rhythms in lactating dairy cows.

Key words: Intake rhythm, Feeding time, Chronophysiology, Dairy cow

 

Electrosurgical Excision of a large uniform Transmissible Venereal Tumor (TVT) in a spayed bitch: a case report

 

H. Soleimani Savadkoohi, S.N. Dehghani*, F. Namazi, M. Ahrari Khafi, Y. Jalali

60-64

Abstract

   Canine transmissible venereal tumors (TVT) are cauliflower-like, pedunculated, and nodular, papillary, or multilobulated in appearance. The presenting bitch had a serosanguineous vulvar discharge and big mass in the perinea area. After initial preparation, sonography and radiological imaging was performed to find out any metastatic mass in abdomen or thorax region. Following general anesthesia the tumor was excised by electrosurgical technique. The resected tumor was sent for histopathological evaluation. A chemotherapy regimen was set up for the dog following the operation. A check up six months later didn’t show any recurrence of the mass in this case. This was a rare case of TVT in a spayed bitch.

Key words: Transmissible Venereal Tumor, electro surgery, bitch

 

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japscjournal

Journal of Animal and Poultry Sciences ( ISSN: 2147-9267 ) is a peer-reviewed, open access journal which aims to publish top quality papers related to all aspects of animal and poultry sciences including Nutrition, Disease, Physiology, Breeding and Genetics, Reproduction, Biotechnology, Livestock and Poultry Farming System, Laboratory Science, Ethology and Welfare.