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Dive into the research topics where Giovani Jacob Kolling is active.

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Featured researches published by Giovani Jacob Kolling.


International Journal of Biometeorology | 2016

Relationship between physical attributes and heat stress in dairy cattle from different genetic groups

Evelyn Priscila München Alfonzo; M. V. G. B. Silva; Darlene dos Santos Daltro; Marcelo Tempel Stumpf; Vanessa Calderaro Dalcin; Giovani Jacob Kolling; Vivian Fischer; Concepta McManus

Dairy cattle raised under harsh conditions have to adapt and prevent heat stress. The aim of this study was to evaluate physical characteristics and their association with heat tolerance in different genetic groups of dairy cattle. Thickness of the skin and coat, length and number of hairs, body measurements, as well as physiological parameters and body temperatures by infrared thermography were determined in 19 Holstein and 19 Girolando (½ and ¾ Holstein) cows. The Holstein cattle were less tolerant to heat stress than Girolando (GH50 and GH75 Holstein), because of the difficulty in dissipating heat due to the larger body size, as well as thicker and longer hairs. The correlations between physical characteristics, physiological parameters, and thermographic measurements prove to be inconsistent among genetic groups and therefore are not predictive of heat tolerance, while the regressions of morphometric characteristics on physiological and thermographic measures were not significant. Thus, the physical characteristics were not good predictors of physiological indices and thermographic temperature and so should not be used.


Animal | 2013

Severe feed restriction increases permeability of mammary gland cell tight junctions and reduces ethanol stability of milk.

Marcelo Tempel Stumpf; Vivian Fischer; C. M. McManus; Giovani Jacob Kolling; Maira Balbinotti Zanela; C. S. Santos; A. S. Abreu; Paula Montagner

A total of twelve lactating Jersey cows were used in a 5-week experiment to determine the effects of severe feed restriction on the permeability of mammary gland cell tight junctions (TJs) and its effects on milk stability to the alcohol test. During the first 2 weeks, cows were managed and fed together and received the same diet according to their nutritional requirements (full diet: 15 kg of sugar cane silage; 5.8 kg of alfalfa hay; 0.16 kg of mineral salt and 6.2 kg of concentrate). In the 3rd week, animals were distributed into two groups of six cows each. One group received the full diet and the other a restricted diet (50% of the full diet). In the 4th and 5th weeks, all animals received the full diet again. Milk composition and other attributes, such as titratable acidity, ethanol stability, pH, density and somatic cell count (SCC) were evaluated. Cortisol levels indicated the stress condition of the cows. Plasma lactose and milk sodium were measured to assess mammary TJ leakiness. Principal factor analysis (PFA) showed that the first two principal factors (PFs) contributed with 44.47% and 20.57% of the total variance in the experiment and, as feeding levels increased, milk stability to the ethanol test became higher and plasma lactose levels decreased, which indicates lower permeability of the mammary gland cell TJ. Correspondence analyses were consistent with PFA and also showed that lower feeding levels were related to reduced milk stability, high plasma lactose, high sodium in milk, low milk lactose (another parameter used to assess TJ permeability) and higher cortisol levels, indicating the stress to which animals were submitted. All observations were grouped in three clusters, with some of the above-mentioned patterns. Feeding restriction was associated with higher permeability of TJ, decreasing milk stability to the ethanol test.


Pesquisa Agropecuaria Brasileira | 2012

Caracterização eletroforética de proteínas e estabilidade do leite em vacas submetidas à restrição alimentar

Rosângela Silveira Barbosa; Vivian Fischer; Maria Edi Rocha Ribeiro; Maira Balbinotti Zanela; Marcelo Tempel Stumpf; Giovani Jacob Kolling; Jorge Schafhäuser Júnior; Luis Eduardo Barros; Antônio S. Egito

The objective of this work was to evaluate the feeding restriction effects on milk yield and on its electrophoretic protein profile, and to relate them to milk stability to the alcohol test. Two experiments were carried out with Jersey cows: in the first one, the effect of 40% feed restriction was evaluated on semiconfined cows; in the second one, the effect of 30% reduction in total digestive nutrients was evaluated on confined cows. Protein fractions were determined by electrophoresis and their quantification was done by image analysis. Milk samples were classified according to their stability in the 72°GL‑alcohol test. The 40% feed restriction for semiconfined cows decreased milk yield, but it did not change milk protein contents and stability; in this case, unstable milk showed larger contents of β‑casein and total proteins, but lower κ‑casein in comparison to stable milk. The 30% restriction of energy supply for confined cows did not reduce milk yield, but decreased the percentage of serum bovine albumin and milk stability; in this case, unstable and stable milk did not differ as for protein fractions.


Revista Brasileira De Zootecnia | 2016

Physiological parameters for thermal stress in dairy cattle

Vanessa Calderaro Dalcin; Vivian Fischer; Darlene dos Santos Daltro; Evelyn Priscila München Alfonzo; Marcelo Tempel Stumpf; Giovani Jacob Kolling; M. V. G. B. Silva; Concepta McManus

The objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (1/2, 3/4, and pure bred Holstein (HO)). Analysis of variance considering the effects of genetic group, days, and their interaction as well as linear and quadratic effect of the black globe humidity index (BGHI) was performed, as well as broken-line regression. These values were higher in pure HO than in 3/4 and 1/2 groups. The average BGHI during the morning was 74, when 70, 43, and 13% of pure HO, 3/4, and 1/2, respectively, presented RR above reference value. The RR was the best indicator of heat stress and its critical value was 116 breaths/min for 1/2, 140 for 3/4, and 168 breaths/min for pure HO cows. In the HO group, physiological variables increased linearly with BGHI, without presenting inflection in the regression. The inflection point occurred at a higher BGHI for the 1/2 group compared with the other groups. Hematocrit and HEMO were different among genetic groups and did not vary with BGHI, showing that stress was not sufficient to alter these hematological parameters. The 1/2 HO group was capable of maintaining normal physiological parameters for at least 3 BGHI units above that of HO and 1 to 3 units higher than 3/4 HO for RR and RT, respectively. Respiratory rate is the physiological parameter that best predicts heat stress in dairy cattle, and the 1/2 Holstein group is the best adapted to heat stress.


The Scientific World Journal | 2016

Oregano Extract Added into the Diet of Dairy Heifers Changes Feeding Behavior and Concentrate Intake.

Giovani Jacob Kolling; Dejani Maíra Panazzolo; Alexandre Mossate Gabbi; Marcelo Tempel Stumpf; Marcel Batista dos Passos; Eduardo Augusto da Cruz; Vivian Fischer

This experiment aimed to describe the effects of Oregano extract (OE) inclusion into the concentrate fed to dairy heifers on physiological parameters, feeding behavior, intake, and performance. Thirty-two Holstein heifers were randomly distributed into four treatments: C = control, without addition of OE; OE2.5 = 2.5 g; OE5.0 = 5.0 g and OE7.5 = 7.5 g of Oregano extract per heifer/day. Feeding behavior and concentrate intake were assessed individually every day and total dry matter intake (DMI) was determined on the last week of the trial. Compared to control group, OE7.5 reduced by 32% the latency time to approach the feed bunk but increased by 6% the time spent eating the concentrate. Each inclusion of 2.5 grams of OE into the concentrate increased the occurrence of postingestive licking the feed bunk with abundant saliva production 1.2 times (P < 0.01) and tended to increase the occurrence of sneeze events 1.2 times (P < 0.10). No statistical difference was detected between treatments for total DMI, but concentrate DMI was 9% lower for OE7.5 when compared to control and OE2.5. The inclusion of 7.5 grams/day of OE causes small but negative effects in feeding behavior and concentrate intake, without change on total dry matter intake.


Pesquisa Agropecuaria Brasileira | 2013

Metabolic attributes, yield and stability of milk in Jersey cows fed diets containing sodium citrate and sodium bicarbonate

Marcelo Tempel Stumpf; Vivian Fischer; Giovani Jacob Kolling; Maira Balbinotti Zanela; Maria Edi Rocha Ribeiro; A. S. Abreu

The objective of this work was to evaluate the inclusion of sodium citrate and sodium bicarbonate in the diet of lactating Jersey cows, and its effects on the metabolic attributes, productivity and stability of milk. We evaluated urinary pH, levels of glucose and urea in blood, body weight, body condition score, milk yield, milk stability (ethanol test), and milk physicochemical properties of 17 cows fed diets containing sodium citrate (100 g per cow per day), sodium bicarbonate (40 g per cow per day) or no additives. Assessments were made at the 28 th and 44 th days. Supply of sodium citrate or bicarbonate has no influence on the metabolic attributes, productivity, body weight, and body condition score of the cows, neither on the composition and stability of milk.


Computers and Electronics in Agriculture | 2016

Infrared thermography in animal production

Concepta McManus; Candice Bergmann Tanure; Vanessa Peripolli; Luiza Seixas; Vivian Fischer; Alexandre Mossate Gabbi; Silvio Renato Oliveira Menegassi; Marcelo Tempel Stumpf; Giovani Jacob Kolling; Eduardo Antunes Dias; João Batista G. Costa


Archive | 2011

Instabilidade do leite de quartos mamários de vacas com mastite: resultados preliminares.

Giovani Jacob Kolling; Maira Balbinotti Zanela; Marcelo Tempel Stumpf; Vivian Fischer; C. da S. dos Santos; Maria Edi Rocha Ribeiro; A. S. de Abreu


Revista Brasileira De Zootecnia | 2017

Infrared thermography as a method for evaluating the heat tolerance in dairy cows

Darlene dos Santos Daltro; Vivian Fischer; Evelyn Priscila München Alfonzo; Vanessa Calderaro Dalcin; Marcelo Tempel Stumpf; Giovani Jacob Kolling; M. V. G. B. Silva; Concepta McManus


Ciencia Rural | 2016

Behaviors associated with cows more prone to produce milk with reduced stability to ethanol test due to feeding restriction

Marcelo Tempel Stumpf; Vivian Fischer; Giovani Jacob Kolling; Alessandra Ventura da Silva; Maria Edi Rocha Ribeiro; Carolina da Silva dos Santos

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Vivian Fischer

Universidade Federal do Rio Grande do Sul

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Marcelo Tempel Stumpf

Universidade Federal do Rio Grande do Sul

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Maria Edi Rocha Ribeiro

Empresa Brasileira de Pesquisa Agropecuária

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Maira Balbinotti Zanela

Empresa Brasileira de Pesquisa Agropecuária

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Darlene dos Santos Daltro

Universidade Federal do Rio Grande do Sul

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Evelyn Priscila München Alfonzo

Universidade Federal do Rio Grande do Sul

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M. V. G. B. Silva

Empresa Brasileira de Pesquisa Agropecuária

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Vanessa Calderaro Dalcin

Universidade Federal do Rio Grande do Sul

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A. S. Abreu

Universidade Federal do Rio Grande do Sul

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