Effects of calcium soaps and rumen undegradable protein on the milk production and composition of dairy ewes

1999 ◽  
Vol 66 (2) ◽  
pp. 177-191 ◽  
Author(s):  
RAMON CASALS ◽  
GERARDO CAJA ◽  
XAVIER SUCH ◽  
CELINA TORRE ◽  
SERGIO CALSAMIGLIA

Forty-eight Manchega dairy ewes were used during a complete lactation in a 2×2 factorial design to determine the effects of supplementing diets with fat (calcium soaps of palm oil fatty acids, CSFA) and rumen undegradable protein (RUP) on milk production and composition. Factors tested were amounts of CSFA (0 or 200 g/kg) and RUP (300 or 450 g/kg crude protein) in the concentrate. RUP was altered by adding a mixture of maize gluten meal and blood meal. Lactation was divided into one nursing period (period 1, weeks 1–4), and three milking periods (periods 2–4, weeks 5–8, 9–14 and 15–21). Concentrates were given at 0–8 kg/d during periods 1 and 2, and at 0–6 kg/d in periods 3 and 4. Ewes grazed rotationally in an Italian rye-grass pasture and received a daily supplement of 0·8 kg vetch–oat hay during period 1, and 0·3 kg lucerne hay during periods 2–4. For the whole lactation, supplemental fat markedly increased milk fat content (+23%) and yield (+16%), and decreased milk protein content (−9%). The positive effect of feeding CSFA on milk fat content was more evident at the beginning of lactation; however, its negative effect on milk protein was more pronounced in late lactation. Supplementary RUP had little effect, increasing milk protein content only in period 3, when the crude protein content of pasture was lower. Milk yield and lamb growth were not affected by dietary treatments. The results indicated that CSFA can be useful for increasing the milk fat content of dairy ewes at pasture, which may help farmers to produce milk reaching the minimum requirements of fat content for the cheese industry.

Author(s):  
Martin Skýpala ◽  
Gustav Chládek

Milk yield varies during lactation, following what is termed a lactation curve. ŽIŽLAVSKÝ and MIKŠÍK (1988) recorded changes in milk yield within a day, too. TEPLÝ et al. (1979) a KOUŘIMSKÁ et al. (2007) published variation within a day ± 1.10 kg in milk yield, ± 0.75 % in milk fat content and ± 0.20 % in milk protein content. Milk yield of cows can be expressed in many different ways, for instance, in kilograms per lactation or in kilograms per day. A practical parameter describing milk production is milk yield (kg) per milking.The object of experiment were 12 cows of Holstein cattle on the first lactation from the 100-day of lactation to 200-day of lactation. The samples of milk were collected from January to May 2007, once a month from the morning and evening milking (milking interval 12 h ± 15 min.). The following parameters were monitored: milk production – milk yield (kg), milk protein production (kg), milk fat production (kg); milk composition – milk protein content (%), milk fat content (%), lactose content (%), milk solids-not-fat content (%), milk total solids content (%); technological properties of milk – ti­tra­tab­le acidity (SH), active acidity (pH), rennet coagulation time (s), quality of curd (class) and somatic cell count as a parameter of udder health.Highly significant differences were found (P < 0.01) between morning milk yield (15.7 kg) and evening milk yield (13.8 kg), between morning milk protein production (0.51 kg) and evening milk protein production (0.45 kg) and between evening milk fat content (4.41 %) and morning milk fat content (3.95 %). A significant difference (P < 0.05) was found between morning milk total solids content (12.62 %) and evening milk total solids content (12.07 %). No significant differences were found between morning (M) and evening (E) values of the remaining parameters: milk fat production (M 0.62 kg; E 0.60 kg), milk protein content (M 3.24 %; E 3.27 %), milk lactose content (M 4.78 %; E 4.86 %), milk solids-not-fat content (M 7.69 %; E 7.71 %), somatic cell count (M 80 000/1 mL; E 101 000/1 mL), titratable aci­di­ty (M 7.75 SH; E 7.64 SH), active acidity (M pH 6.58; E pH 6.61), rennet coagulation time (M 189 s.; E 191 s.), quality of curd (M 1.60 class; E 1.57 class).


Nativa ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 145
Author(s):  
Maura Frare Menegon ◽  
Claudineli Cassia Bueno da Rosa ◽  
Carmen Wobeto ◽  
Marcia Rodrigues Carvalho Oliveira ◽  
Henrique Melo da Silva ◽  
...  

Objetivou-se avaliar o método de espectroscopia por ultrassom (EU) e o efeito do congelamento do leite nas análises de gordura e proteína do leite de vaca. Cem amostras foram analisadas imediatamente após a coleta em tanque de expansão (in natura), congeladas a -20ºC por 30 dias e novamente analisadas por métodos oficiais (gordura por butirômetro de Gerber e proteína por micro-Kjeldahl) e por EU. Observou-se efeito de interação (P < 0,01) entre o método analítico e congelamento do leite. A EU superestimou (P < 0,01) o teor de gordura e subestimou (P < 0,01) o teor de proteína no leite in natura ou congelado. O congelamento não afetou (P = 0,15) o teor de gordura obtido pelo método oficial, mas reduziu o teor de gordura (P < 0,01) obtido com a EU. O congelamento aumentou (P < 0,01) o teor de proteína obtido pelo método oficial, mas reduziu (P < 0,01) quando obtido por EU. Os teores de gordura e proteína do leite obtidos pelo método de EU são divergentes daqueles obtidos por métodos oficiais, independente da amostra ser in natura ou congelada.Palavras-chave: método analítico; análise química; correlação. EFFICACY OF ULTRASONIC SPECTROSCOPY AND FREEZING IN EVALUATION OF MILK CHEMICAL COMPOSITION ABSTRACT: The objective was to evaluate the ultrasound spectroscopy (US) method and the effect of milk freezing on the cow's milk fat and protein analysis. One hundred samples were collected from one milk tank, immediately analyzed, and frozen at -20ºC for 30 days and analyzed again by official method (fat: Gerber butyrometer, protein: micro-Kjeldahl) and US. It was observed effect of interaction (P < 0.01) between analytical method and milk freezing. Ultrasound spectroscopy overestimated milk fat content and underestimated milk protein content on in natura or frozen. The milk freezing for 30 days did not affect the milk fat content obtained by official method (P = 0.15), but it reduced the milk fat content (P < 0.01) obtained by US. The milk freezing increased (P < 0.01) the milk protein content obtained by official method, but reduced (P <0.01) when obtained from US. The milk fat and protein content obtained by US are different from those obtained by official methods, regardless of the sample is in natura or frozen.Keywords: analytical method; chemical analysis; correlation.


1990 ◽  
Vol 38 (3B) ◽  
pp. 461-474
Author(s):  
Y.S. Rijpkema ◽  
L. van Reeuwijk ◽  
P.W. Goedhart

In three 24-wk experiments beginning at wk 4 post partum, a system of concentrate feeding at a flat level was compared with feeding concentrates to milk yield (experiments 1 and 2), or with a high-low 2-step system in which the rate was reduced after wk 12 (experiment 3). Roughage was offered ad lib. In experiment 1 two types of concentrates were involved whereas in experiment 3 two levels of concentrates were applied. The systems were evaluated using high levels of concentrates and with Friesian and Holstein-Friesian cows producing about 7000 kg milk/lactation. Experiments 1 and 3 involved 64 and experiment 2 32 cows. In the comparison between feeding strategies, differences in yield and composition of milk were of minor importance except for milk protein content on the moderate-quality grass silage diet (experiment 1). Milk production tended to be higher for concentrates including fish meal, in contrast to soyabean meal, particularly in the first half of the experimental period. However, milk fat content was significantly lower, resulting in similar productions of 4%-FCM. Extra concentrates in experiment 3 had significant positive effects on the production of milk, fat and protein, and also on milk protein content and liveweight gain. Feeding strategy however, was without any significant effect. It was concluded that with the high-yielding cows, offered roughages to appetite, there is no need to feed concentrates strictly to their estimated individual energy requirements. This may be of increasing importance when forage allowances/cow increase as a consequence of smaller numbers of cows/farm. (Abstract retrieved from CAB Abstracts by CABI’s permission)


1989 ◽  
Vol 29 (3) ◽  
pp. 309 ◽  
Author(s):  
SC Valentine ◽  
BD Bartsch

Friesian cows in early lactation were fed 3.5 or 7.0 kg DM daily of either hammermilled lupin grain, hammermilled oaten grain or whole oaten grain as supplements to a pasture-based diet. Milk production and composition and the amount and composition of whole oaten grain excreted in the faeces were measured. There were no significant differences between treatments in the yields of milk, fat or protein. There was a tendency towards lower milk fat content in milk from cows fed 7.0 kg DM daily of the hammermilled grains. Differences between grain types were not significant for all production parameters except milk protein content. Protein content was significantly (P<0.01) higher in milk from cows fed hammermilled and whole oaten grain compared with that from cows fed lupin grain. Yield of milk fat was significantly (P<0.05) higher and ratio of milk protein to fat significantly (P < 0.05) lower for cows fed 3.5 kg DM of grain than for those fed 7.0 kg DM of grain. There was a significant (P< 0.05) interaction between grain type and grain level for the ratio of protein to fat in the milk. Cows excreted 24% of the whole oaten grain at both levels of grain fed and there were no significant differences in composition of the whole oaten grain fed or excreted in the faeces. There was no benefit to production either from feeding hammermilled lupin grain compared with hammermilled or whole oaten grain or from feeding 7.0 compared with 3.5 kg DM daily of grain to cows grazing pasture.


Author(s):  
Gustav Chládek ◽  
Vladimír Čejna

The freezing point of milk (FPM) is an instant indicator of violated technological quality of raw milk, especially of dilution. FPM can also vary due to numerous effects associated with changes in milk composition and milk characteristics. Beside the effect of season, phase of lactation, breed, milk yield, sub-clinical mastitis etc. the impacts of nutrition and dietary or metabolic disorders are the most significant and the most frequent (GAJDŮŠEK, 2003). FPM is a relatively stable physical characteristic and due to osmotically active elements it ranges from – 0.510 to – 0.535 °C (HANUŠ et al., 2003b). Recently ŠUSTOVÁ (2001) studied the freezing point of milk in pool samples; she observed seasonal changes in FPM of mixed milk and the effect of different diets on FPM values. KOLOŠTA (2003) looked into the effect of grazing season on FPM. HANUŠ et al. (2003a) analysed possible effects of handling of milk components on FPM.The aim of this work was to describe the relationship between FPM and milk components and the impact of breed, number and phase of lactation on FPM. We analysed 328 milk samples in total, out of which 137 samples were of Czech Pied cows and 191 samples of Holstein cows. The effect of number and phase of lactation was evaluated for both breeds together. The greatest coefficients of correlation in total were found between FPM and lactose content (r = 0.600) and solids non fat (r = 0.523). Lower coefficients of correlation were found between FPM and milk fat content (r = 0.235), milk protein content (r = 0.260) and urea concentration (r = 0.256). These coefficients were considerably lower in Holstein cows than in Czech Pied cows. The coefficients of correlation between FPM and number and phase of lactation and somatic cells count were insignificant. The total mean value of FPM was – 0.534 °C. Breed statistically significantly (P<0.01) affected FPM (+0.006 °C in C breed) and milk fat content (+0.19 % in H breed). Breed highly significantly (P<0.001) affected daily milk yield (+4.9 kg milk in H), milk protein content (+0.27 % in C) and solids non fat (+0.37 % in C). On the contrary, breed had no significant effect on lactose content, urea concentration and somatic cells count.Variability of FPM was greater in Czech Pied cows (5.9 %) than in Holstein cows (0.9 %). Number of lactation had no significant effect on FPM (maximum difference between lactations was 0.008 °C). Phase of lactation had no significant effect on FPM either. Our study revealed the fact that FPM was most of all affected by lactose content and solids non fat. However, the decrease of lactose content was compensated by a tendency of mammary glad to keep constant osmotic pressure. As the somatic sells count was low, there was no decline in lactose content during later lactations so no significant decrease of FPM occurred.


2015 ◽  
Vol 67 (3) ◽  
pp. 927-934 ◽  
Author(s):  
G.A. Gagliostro ◽  
E.M. Patiño ◽  
M. Sanchez Negrette ◽  
G. Sager ◽  
L. Castelli ◽  
...  

The aim of the study was to examine the changes in milk fatty acid (FA) profile of grazing buffaloes fed either low (L, 276g/d) or high (H, 572g/d) doses of a blend (70:30, wt/wt) of soybean and linseed oils. Fourteen multiparous Mediterranean buffaloes grazing on a native pasture were fed 4 kg/day of a commercial concentrate containing no supplemental oil over a pre-experimental period of ten days. The baseline milk production and composition and milk FA profile were measured over the last three days. After this pre-experimental period the animals received the same concentrate added with either the L or H oil doses for 26 additional days. Milk yield (g/animal/day) did not differ at the start (1776 ± 522 and 1662 ± 291 for L and H, respectively, P<0.622) or at the end of the trial (4590 ± 991 and 4847 ± 447 in L and H, respectively, P<0.543). Baseline milk fat content (g/kg) averaged 77.1 (±20.5) in L and 74.3 (±9.9) in H (P<0.10) and was reduced (P<0.031) to 60.7 (±23.6) and 49.4 (±11.2) (P<0.0031) respectively after L and H with no differences between treatments (P<0.277). Baseline milk protein content (L=43.2 ± 3.4 and H= 44.3 ± 6.9g/kg) increased after oil supplementation (P<0.0001) in both L (73.2 ± 6.0g/kg) and H (68.4 ± 4.9g/kg) without differences between oil doses (P<0.123). Milk fat content of 14:0 decreased after oil supplementation only in the H treatment (5.29 to 4.03, P<0.007) whereas that of 16:0 was reduced (P<0.001) at both L (24.49 to 19.75g/100g FA) and H (25.92 to 19.17g/100g FA) doses. The reduction of total content of 12:0 to 16:0 was higher (P<0.052) in H (32.02 to 23.93g/100g FA) than L (30.17 to 25.45g/100g FA). Vaccenic acid content increased (P<0.001) from 5.70 to 13.24g/100g FA in L and from 5.25 to 16.77 in H, with higher results in the in H treatment (P<0.001). Baseline rumenic acid was sharply increased (P<0.001) in L (1.80 to 4.09g/100g FA, +127%) and H (1.60 to 4.61g/100g FA, +187%) with no differences between L and H (P<0.19). Overall, these results indicate a pronounced improvement in the nutritional value of milk fat from grazing buffaloes fed little amounts (0.276g/day) of a blend of soybean and linseed oils.


Author(s):  
A Gavelis ◽  
V. Þilaitis ◽  
A Juozaitis ◽  
V. Juozaitienë ◽  
G. Urbonavièius ◽  
...  

The aim of this study was to evaluate relationship between milk progesterone concentration (P4) and milk traits at the start of estrus time and 12h after start of the estrus in dairy cows. The 96 milk samples of 48 Lithuanian dairy cows without reproduction disorders and 90–100 days after calving were evaluated. Cows were classified into two groups based on milk yield per day: less than 30 kg (n=20) and e”30 kg (n=28). Data were categorized by milk fat and protein content at the start estrus and 12h after start of estrus to evaluate relationship between P4 and milk traits examined. P4 at estrus time in dairy cows was significantly positively correlated with milk yield (P less than 0.001), whereas it was negatively correlated with milk protein (P less than 0.05-P less than 0.01) and fat at 12h after start of estrus. Dairy cows with F/P from 1.0 to 1.5 had the lowest P4 in milk. Results of the pregnancy in dairy cows were related with lower P4 and milk yield level (P less than 0.001), higher milk fat (P less than 0.05) and milk protein content (P less than 0.001). These cows had 1.90 times lower prevalence of the signs of subclinical ketosis (P less than 0.05) at estrus time when compared with non-pregnant cows. As a result, it was clearly demonstrated that P4 in dairy cows can help to evaluate and improve the reproductive properties of cows.


1990 ◽  
Vol 30 (1) ◽  
pp. 7 ◽  
Author(s):  
SC Valentine ◽  
BD Bartsch

Milk production and composition was determined in Holstein-Friesian cows fed either 3.5 or 7.0 kg dry matter (DM) daily of lupin grain, pea grain, faba bean grain or barley grain with or without 1.5% added urea, as supplements to an oaten hay based diet. All the grains were hammermilled. Daily yields of milk (L), fat (kg) and protein (kg) were significantly (P<0.05) higher for cows fed lupin (20.0, 0.81, 0.57), pea (18.9, 0.80, 0.56) and faba bean (18.9, 0.79,0.55) grains compared with those of cows fed barley grain with (17.8, 0.73, 0.51) or without (18.0, 0.71, 0.52) urea. Yields of milk (L), fat (kg) and protein (kg) and milk protein content (g/kg) were significantly (P<0.05) higher when 7.0 kg DM (19.5, 0.80, 0.57, 29.6) compared with 3.5 kg DM (18.0,0.73,0.51,29.0) of grain was fed. There were no significant differences between treatments in hay DM intake by cows fed 3.5 kg DM of grain daily. A significantly (P<0.05) higher milk fat production per unit DM intake was recorded for cows fed legume compared with barley grain. There were generally higher returns above grain cost for cows fed legume compared with barley grain and for cows fed 4 kg compared to 8 kg daily of grain. It was concluded that it was more economical to feed 3.5 kg DM of legume grain compared with 3.5 kg DM of barley grain, with or without urea, as supplements for cows offered cereal hay in early lactation. However, the economics of feeding 7.0 kg DM of legume grain compared with 7.0 kg DM of barley grain and 7.0 kg DM compared with 3.5 kg DM of grain will depend on the costs of relative changes in hay intake associated with these practices.


2015 ◽  
Vol 31 (2) ◽  
pp. 245-253 ◽  
Author(s):  
N. Maksimovic ◽  
F. Bauman ◽  
M.P. Petrovic ◽  
V.C. Petrovic ◽  
D. Ruzic-Muslic ◽  
...  

The purpose of this study was to evaluate present level of productivity and determine linear body traits of Alpine goats raised in Serbia on smallholder farms. Data were collected from 22 smallholder farms located in Belgrade district, with total of 330 purebred Alpine does 2-9 years of age, 145 yearling does and 476 kids. Traits measured were: body weight of does, body weight of kids at birth, 30 days of age and at weaning (90-120 days), prolificacy of mature and yearling (primiparous) does, six linear body traits of does (wither height, body length, hearth girth, chest depth, chest width, pelvic width) and milk production (milk yield, milk fat and milk protein content). The analysis showed the average body weight of does to be 54.96 kg, while the average body weight of kids at birth, 30 days of age and weaning was 2.73 kg, 8.7 kg and 18.3 kg., respectively. Prolificacy was 144% in mature and 125% in yearling does. Measurements of linear body traits were: wither height 67.87 cm, body length 71.92 cm, hearth girth 81.79 cm, chest depth 32.93, chest width 21.49 cm and pelvic width 17.63 cm. Among dairy production traits, following results were obtained: lactation length 220.73 days, total milk yield 531.66 kg, milk fat content 3.33% and milk protein content 3.16%. It was concluded that the overall productivity of Alpine goats raised under smallholder production systems in Serbia is satisfying. Giving the fact that these animals are usually kept under poor conditions, many of these productive traits are very good.


Author(s):  
Júlia Laize Bandeira CALGARO ◽  
Júnior FIORESI ◽  
João Pedro VELHO ◽  
Fernanda Hammes STROEHER ◽  
Dileta Regina Moro ALESSIO ◽  
...  

ABSTRACT The aim of the present study was to monitor cow milk quality and composition in two farms in the Noroeste Rio-grandense mesoregion, located in the municipalities of Palmeira das Missões and Pinhal - RS. Both herds were mixed, with animals of the Holstein (70%) and Jersey (30%) breeds. The following overall parameters were evaluated: body condition score (BCS), udder dirtiness, and calving order, and the following milk composition factors were measured: total dry extract (TDE), defatted dry extract (DDE), milk lactose, fat, and protein contents, casein, milk urea nitrogen (MUN), and somatic cell count (SCC). Multivariate statistical analysis was performed, and four factors were identified representing combinations of the measured variables. The first factor comprised negative relationships between milk production and cow breed, milk fat content, and milk protein content. The second factor comprised the positive relationships between lactation days and body condition score and milk protein content. The third factor represented the negative relationships between milk lactose content and SCC score, calving order, and BCS. The fourth factor was composed of the positive relationship between delivery order and udder dirtiness. Cluster analysis revealed that individual cows could be categorized into three groups. Monitoring the breed, calving order, body condition score, lactation days, milk production, fat, protein, and lactose contents, somatic cell counts, and udder dirtiness in cows allows greater control of the herd, allowing potential shortcomings to be rectified quickly and economic losses to production to be minimized.


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