Effects of protein-energetic supplementation frequency on growth performance and nutritional characteristics of grazing beef cattle     

Renata Pereira da Silva-Marques  Joanis Tilemahos Zervoudakis  Nelcino Francisco De Paula  Luciana Keiko Hatamoto-Zervoudakis  Pedro Ivo José Lopes da Rosa e Silva  Núbia Bezerra do Nascimento Matos 《Tropical animal health and production》2018,50(3):495-501

Two experiments were conducted to evaluate reduced supplementation frequencies for grazing beef cattle in rainy season. In experiment 1, evaluating the nutritional parameters, four rumen-cannulated Nellore bulls (BW = 410 kg) were used. In experiment 2, evaluating animal performance, 48 Nellore bulls (BW = 358 kg) were used. The treatments were as follows: mineral supplement (MS) alone and MS plus protein-energy supplement provided 3×, 5× and 7×/week. Supplementation frequency did not affect (P > 0.05) intake and digestibility. Average daily gain was greater (P < 0.001) to supplementation compared with MS. The supplementation 5×/week resulted in greater weight gain per hectare (9.24) and higher economic returns during the study period (1.64%) compared to other supplementations. Supplementation 5×/week increased animal performance and positively influenced economic returns.  相似文献   

Effect of sodium acetate and sodium nitrate on biochemical composition of green algae Ulva rigida     

İlknur Ak  Cenk Öztaşkent  Yeliz Özüdoğru  Tolga Göksan 《Aquaculture International》2015,23(1):1-11

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Physiological Response of Multiple Contrasting Rice (Oryza sativa L.) Cultivars to Suboptimal Temperatures          下载免费PDF全文

M. M. Rachoski  A. Vidal  O. A. Ruiz  A. B. Menéndez  A. A. Rodríguez 《Journal of Agronomy and Crop Science》2015,201(2):117-127

The physiological response of multiple rice cultivars, eighteen initially and eight cultivars later on, to suboptimal temperatures (ST) conditions was investigated in laboratory and outdoor experimental conditions. Treatment with ST decreased growth in different extents according to the cultivar and affected the PSII performance, determined by chlorophyll fluorescence fast‐transient test, and stomatal conductance, regardless the experimental condition. Two groups of cultivars could be distinguished on the base of their growth and physiological parameters. The group of cultivars presenting higher growths displayed optimal JIP values, and higher instantaneous water use efficiency (WUE_i), due to a lower Gs under ST, unlike cultivars showing lower growth values, which presented worse JIP values and could not adjust their Gs and hence their WUE_i. In this work, we detected at least two cultivars with superior tolerance to ST than the cold tolerant referent Koshihikari. These cultivars could be used as parents or tolerance donors in breeding for new crop varieties. On other hand, positive and significant correlations between data obtained from laboratory and outdoor experiments suggest that laboratory measurements of most of the above mentioned parameters would be useful to predict the response of rice cultivars to ST outdoor.  相似文献   

Comparison of selection methods among and within full-sibling progenies in Urochloa humidicola     

Yasmin Vasques Berchembrock  Ulisses José de Figueiredo  José Airton Rodrigues Nunes  Cacilda Borges do Valle  Sanzio Carvalho Lima Barrios 《Grass and Forage Science》2020,75(2):145-152

Hybridization in the Urochloa humidicola breeding programme allowed to explore the genetic variability of the apomictic sources and, thus, to obtain new sexual and apomictic parents with compatible ploidy and/or superior progenies. However, given the high variability arising from crosses, there is a need to adopt efficient selection strategies among and within progenies. The aim of this study was to compare the selection methods among U. humidicola progenies with (t-BLUP) and without (BLUP) the weighting based on prediction error and subsequent selection within progenies by individual simulated (BLUP_IS) or optimal individual BLUP. We evaluated seventy-one U. humidicola full-sib progenies from biparental crosses between nine sexual and ten apomictic parents. The experiment was set up in an incomplete block design with 64 blocks of 15 plots each, consisting of individual plants. Seven consecutive cuts were made and the traits total dry-matter, leaf dry-matter and regrowth scores were measured. Genetic variance was expressive for all traits. The selection procedure among progenies of U. humidicula based on t-BLUP proved to be more advantageous regarding the use of BLUP not weighted by the prediction error, resulting in higher selection gains, taking as reference the optimal procedure of the individual BLUP. Furthermore, the use of BLUP_IS allowed an optimized selection of hybrids, allowing the breeder to explore with variable selection intensity the genetic variability within the selected full-sib progenies based on relative genetic merit.  相似文献   

Effects of gossypol from cottonseed cake on the blood profile in sheep     

Antônio Carlos Lopes Câmara  André Menezes do Vale  Cláudio Roberto Scabelo Mattoso  Marília Martins Melo  Benito Soto-Blanco 《Tropical animal health and production》2016,48(5):1037-1042

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Intake,digestibility and performance of lambs fed diets containing peach palm meal     

Alana Batista dos Santos  Mara Lúcia Albuquerque Pereira  Herymá Giovane de Oliveira Silva  Gleidson Giordano Pinto de Carvalho  Taiala Cristina de Jesus Pereira  Leandro Sampaio Oliveira Ribeiro  José Augusto Gomes Azevêdo  Maria das Graças Conceição Parada Costa Silva  Larisse Borges Sousa  Leandro Borges Sousa  Daiane de Oliveira Alencar 《Tropical animal health and production》2016,48(3):509-515

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Influences of Sex and Age on the Hematological Profile of the Jundiá (Silver Catfish) Rhamdia quelen     

Nivaldo Ferreira do Nascimento  Laura Satiko Okada Nakaghi  Cleonice Cristina Hilbig  Arlene Sobrinho Ventura  Ana Carolina Barni de Azevedo  Andressa Fierli Dean 《Journal of aquatic animal health》2016,28(3):161-165

In this study, sex and age influenced the hematological profiles of Jundiá (Silver Catfish) Rhamdia quelen. Females showed lower levels of hemoglobin, young fish increased lymphocyte counts, and older fish increased hematocrit values. These results indicate that, depending on age and sex, the fish have disparate hematological profiles. For this reason, it is important to consider the sex and age of an R. quelen when examining the impact of environmental and management factors on this species in terms of their hematological profiles.

Received May 24, 2015; accepted March 24, 2016 Published online August 2, 2016  相似文献   

Differential transcriptional responses underlie dietary induction of intestinal carbohydrase activities in house sparrow nestlings          下载免费PDF全文

C. Gatica‐Sosa  P. Brzęk  J. G. Chediack  F. D. Cid  W. H. Karasov  E. Caviedes‐Vidal 《Journal of animal physiology and animal nutrition》2016,100(2):236-242

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Predation performance and survival of susceptible and pyrethroid-resistant Eriopis connexa Germar (Coleoptera: Coccinellidae) to insecticides used in brassica crops     

Rogério Lira  Deividy Vicente do Nascimento  Paulo Roberto Ramos Barbosa  Alvin M. Simmons  Jorge Braz Torres 《Pest management science》2023,79(8):2704-2712

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Natural Stable Isotopes for Determination of Gastrointestinal Transit Time in Fish          下载免费PDF全文

Lidiane Cristina Gonçalves de Sandre  Hellen Buzollo  Thiago Matias Torres do Nascimento  Lígia Maria Neira  Eduardo Gianini Abimorad  Rosangela Kiyoko Jomori  Carlos Ducatti  Maria Célia Portella  Dalton José Carneiro 《Journal of the World Aquaculture Society》2016,47(1):113-122

This study evaluated the application of stable isotopes of carbon as an alternative and more accurate method to determine gastrointestinal transit time (GTT) in fish by comparing it to the inert marker method. The stable isotope method detects alterations of the normal carbon flow in a biological system by analyzing naturally occurring isotopes of carbon, contrary to studies based on conventional techniques that apply external markers to the diet to determine GTT through visual observation of the color change in feces. Therefore, 320 pacu, Piaractus mesopotamicus juveniles were reared in 32 tanks under two different temperatures (25 and 29 C). The pacu juveniles received two different diets, one based on ingredients derived from C₃ photosynthetic cycle plants and the other based on C₄ plant ingredients, both containing titanium oxide (TiO₂) as a marker. After 40 d, the isotopic signature of the diets was changed, and the marker was replaced by chromic oxide (Cr₂O₃). In the isotopic technique, the feces were analyzed to determine the exchange in the isotopic ratio of carbon δ¹³C. Both methods found that GTT was faster (nearly 6 h) in fish at 29 C when using the C₄/C₃ feeding strategy and slower in fish at 25 C using the C₃/C₄ strategy (15 h by inert marker and 18 h by the isotopic method). In conclusion, GTT determination in pacu juveniles using the stable isotope technique exhibits the same accuracy obtained with the inert marker method at temperatures suitable (nearly 29 C) for the metabolism of these animals.  相似文献